Home / 429,132.78-643,759.34-129,579.39

Finding the Fourth Proportional to 429,132.78, 643,759.34 and 129,579.39

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Solution

The fourth proportional to 429,132.78, 643,759.34 and 129,579.39 is: 194,387.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,132.78 : 643,759.34 = 129,579.39 : x
  2. Step 2: Convert to fraction form
    429,132.78/643,759.34 = 129,579.39/x
  3. Step 3: Cross multiply
    429,132.78x = 643,759.34 × 129,579.39
  4. Step 4: Simplify right side
    429,132.78x = 83,417,941,936.11
  5. Step 5: Solve for x
    x = 83,417,941,936.11/429,132.78
  6. Step 6: Final answer
    x = 194,387.25

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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.