Home / 15,318.91-21,139.04-8,605.15

Finding the Fourth Proportional to 15,318.91, 21,139.04 and 8,605.15

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Solution

The fourth proportional to 15,318.91, 21,139.04 and 8,605.15 is: 11,874.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,318.91 : 21,139.04 = 8,605.15 : x
  2. Step 2: Convert to fraction form
    15,318.91/21,139.04 = 8,605.15/x
  3. Step 3: Cross multiply
    15,318.91x = 21,139.04 × 8,605.15
  4. Step 4: Simplify right side
    15,318.91x = 181,904,567.03
  5. Step 5: Solve for x
    x = 181,904,567.03/15,318.91
  6. Step 6: Final answer
    x = 11,874.51

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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.