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Finding the Fourth Proportional to 338,737.20, 508,105.98 and 86,036.64

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Solution

The fourth proportional to 338,737.20, 508,105.98 and 86,036.64 is: 129,055.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,737.20 : 508,105.98 = 86,036.64 : x
  2. Step 2: Convert to fraction form
    338,737.20/508,105.98 = 86,036.64/x
  3. Step 3: Cross multiply
    338,737.20x = 508,105.98 × 86,036.64
  4. Step 4: Simplify right side
    338,737.20x = 43,715,731,283.11
  5. Step 5: Solve for x
    x = 43,715,731,283.11/338,737.20
  6. Step 6: Final answer
    x = 129,055.01

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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.