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Finding the Fourth Proportional to 266,145.20, 399,331.20 and 139,882.40

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Solution

The fourth proportional to 266,145.20, 399,331.20 and 139,882.40 is: 209,883.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,145.20 : 399,331.20 = 139,882.40 : x
  2. Step 2: Convert to fraction form
    266,145.20/399,331.20 = 139,882.40/x
  3. Step 3: Cross multiply
    266,145.20x = 399,331.20 × 139,882.40
  4. Step 4: Simplify right side
    266,145.20x = 55,859,406,650.88
  5. Step 5: Solve for x
    x = 55,859,406,650.88/266,145.20
  6. Step 6: Final answer
    x = 209,883.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.