Home / 28,678.91-39,565.86-21,143.16

Finding the Fourth Proportional to 28,678.91, 39,565.86 and 21,143.16

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Solution

The fourth proportional to 28,678.91, 39,565.86 and 21,143.16 is: 29,169.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,678.91 : 39,565.86 = 21,143.16 : x
  2. Step 2: Convert to fraction form
    28,678.91/39,565.86 = 21,143.16/x
  3. Step 3: Cross multiply
    28,678.91x = 39,565.86 × 21,143.16
  4. Step 4: Simplify right side
    28,678.91x = 836,547,308.52
  5. Step 5: Solve for x
    x = 836,547,308.52/28,678.91
  6. Step 6: Final answer
    x = 29,169.42

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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.