Home / 428,959.77-643,423.47-129,432.36

Finding the Fourth Proportional to 428,959.77, 643,423.47 and 129,432.36

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Solution

The fourth proportional to 428,959.77, 643,423.47 and 129,432.36 is: 194,143.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,959.77 : 643,423.47 = 129,432.36 : x
  2. Step 2: Convert to fraction form
    428,959.77/643,423.47 = 129,432.36/x
  3. Step 3: Cross multiply
    428,959.77x = 643,423.47 × 129,432.36
  4. Step 4: Simplify right side
    428,959.77x = 83,279,818,201.49
  5. Step 5: Solve for x
    x = 83,279,818,201.49/428,959.77
  6. Step 6: Final answer
    x = 194,143.66

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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.