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Finding the Fourth Proportional to 438,519.17, 657,860.76 and 138,919.30

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Solution

The fourth proportional to 438,519.17, 657,860.76 and 138,919.30 is: 208,404.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,519.17 : 657,860.76 = 138,919.30 : x
  2. Step 2: Convert to fraction form
    438,519.17/657,860.76 = 138,919.30/x
  3. Step 3: Cross multiply
    438,519.17x = 657,860.76 × 138,919.30
  4. Step 4: Simplify right side
    438,519.17x = 91,389,558,723.19
  5. Step 5: Solve for x
    x = 91,389,558,723.19/438,519.17
  6. Step 6: Final answer
    x = 208,404.94

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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.