Home / 28,431.40-39,235.64-15,685.04

Finding the Fourth Proportional to 28,431.40, 39,235.64 and 15,685.04

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Solution

The fourth proportional to 28,431.40, 39,235.64 and 15,685.04 is: 21,645.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,431.40 : 39,235.64 = 15,685.04 : x
  2. Step 2: Convert to fraction form
    28,431.40/39,235.64 = 15,685.04/x
  3. Step 3: Cross multiply
    28,431.40x = 39,235.64 × 15,685.04
  4. Step 4: Simplify right side
    28,431.40x = 615,412,582.83
  5. Step 5: Solve for x
    x = 615,412,582.83/28,431.40
  6. Step 6: Final answer
    x = 21,645.53

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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.