Home / 428,934.07-643,405.43-129,417.13

Finding the Fourth Proportional to 428,934.07, 643,405.43 and 129,417.13

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Solution

The fourth proportional to 428,934.07, 643,405.43 and 129,417.13 is: 194,127.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,934.07 : 643,405.43 = 129,417.13 : x
  2. Step 2: Convert to fraction form
    428,934.07/643,405.43 = 129,417.13/x
  3. Step 3: Cross multiply
    428,934.07x = 643,405.43 × 129,417.13
  4. Step 4: Simplify right side
    428,934.07x = 83,267,684,177.02
  5. Step 5: Solve for x
    x = 83,267,684,177.02/428,934.07
  6. Step 6: Final answer
    x = 194,127.00

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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.