Home / 15,381.13-21,216.11-9,705.86

Finding the Fourth Proportional to 15,381.13, 21,216.11 and 9,705.86

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Solution

The fourth proportional to 15,381.13, 21,216.11 and 9,705.86 is: 13,387.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,381.13 : 21,216.11 = 9,705.86 : x
  2. Step 2: Convert to fraction form
    15,381.13/21,216.11 = 9,705.86/x
  3. Step 3: Cross multiply
    15,381.13x = 21,216.11 × 9,705.86
  4. Step 4: Simplify right side
    15,381.13x = 205,920,593.40
  5. Step 5: Solve for x
    x = 205,920,593.40/15,381.13
  6. Step 6: Final answer
    x = 13,387.87

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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.