Home / 428,962.08-643,447.92-129,445.50

Finding the Fourth Proportional to 428,962.08, 643,447.92 and 129,445.50

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Solution

The fourth proportional to 428,962.08, 643,447.92 and 129,445.50 is: 194,169.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,962.08 : 643,447.92 = 129,445.50 : x
  2. Step 2: Convert to fraction form
    428,962.08/643,447.92 = 129,445.50/x
  3. Step 3: Cross multiply
    428,962.08x = 643,447.92 × 129,445.50
  4. Step 4: Simplify right side
    428,962.08x = 83,291,437,728.36
  5. Step 5: Solve for x
    x = 83,291,437,728.36/428,962.08
  6. Step 6: Final answer
    x = 194,169.70

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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.