Home / 28,430.65-39,233.81-15,685.05

Finding the Fourth Proportional to 28,430.65, 39,233.81 and 15,685.05

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Solution

The fourth proportional to 28,430.65, 39,233.81 and 15,685.05 is: 21,645.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,430.65 : 39,233.81 = 15,685.05 : x
  2. Step 2: Convert to fraction form
    28,430.65/39,233.81 = 15,685.05/x
  3. Step 3: Cross multiply
    28,430.65x = 39,233.81 × 15,685.05
  4. Step 4: Simplify right side
    28,430.65x = 615,384,271.54
  5. Step 5: Solve for x
    x = 615,384,271.54/28,430.65
  6. Step 6: Final answer
    x = 21,645.10

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.