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Finding the Fourth Proportional to 266,081.40, 399,122.10 and 139,672.80

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Solution

The fourth proportional to 266,081.40, 399,122.10 and 139,672.80 is: 209,509.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,081.40 : 399,122.10 = 139,672.80 : x
  2. Step 2: Convert to fraction form
    266,081.40/399,122.10 = 139,672.80/x
  3. Step 3: Cross multiply
    266,081.40x = 399,122.10 × 139,672.80
  4. Step 4: Simplify right side
    266,081.40x = 55,746,501,248.88
  5. Step 5: Solve for x
    x = 55,746,501,248.88/266,081.40
  6. Step 6: Final answer
    x = 209,509.20

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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.