Home / 28,428.19-39,230.94-15,681.09

Finding the Fourth Proportional to 28,428.19, 39,230.94 and 15,681.09

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Solution

The fourth proportional to 28,428.19, 39,230.94 and 15,681.09 is: 21,639.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.19 : 39,230.94 = 15,681.09 : x
  2. Step 2: Convert to fraction form
    28,428.19/39,230.94 = 15,681.09/x
  3. Step 3: Cross multiply
    28,428.19x = 39,230.94 × 15,681.09
  4. Step 4: Simplify right side
    28,428.19x = 615,183,900.92
  5. Step 5: Solve for x
    x = 615,183,900.92/28,428.19
  6. Step 6: Final answer
    x = 21,639.93

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Half scale
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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.