Home / 28,293.92-39,045.20-15,718.40

Finding the Fourth Proportional to 28,293.92, 39,045.20 and 15,718.40

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Solution

The fourth proportional to 28,293.92, 39,045.20 and 15,718.40 is: 21,691.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,293.92 : 39,045.20 = 15,718.40 : x
  2. Step 2: Convert to fraction form
    28,293.92/39,045.20 = 15,718.40/x
  3. Step 3: Cross multiply
    28,293.92x = 39,045.20 × 15,718.40
  4. Step 4: Simplify right side
    28,293.92x = 613,728,071.68
  5. Step 5: Solve for x
    x = 613,728,071.68/28,293.92
  6. Step 6: Final answer
    x = 21,691.16

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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.