Home / 428,923.71-643,177.08-129,348.45

Finding the Fourth Proportional to 428,923.71, 643,177.08 and 129,348.45

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Solution

The fourth proportional to 428,923.71, 643,177.08 and 129,348.45 is: 193,959.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,923.71 : 643,177.08 = 129,348.45 : x
  2. Step 2: Convert to fraction form
    428,923.71/643,177.08 = 129,348.45/x
  3. Step 3: Cross multiply
    428,923.71x = 643,177.08 × 129,348.45
  4. Step 4: Simplify right side
    428,923.71x = 83,193,958,373.53
  5. Step 5: Solve for x
    x = 83,193,958,373.53/428,923.71
  6. Step 6: Final answer
    x = 193,959.80

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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.