Home / 429,035.28-643,636.80-129,540.24

Finding the Fourth Proportional to 429,035.28, 643,636.80 and 129,540.24

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Solution

The fourth proportional to 429,035.28, 643,636.80 and 129,540.24 is: 194,335.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,035.28 : 643,636.80 = 129,540.24 : x
  2. Step 2: Convert to fraction form
    429,035.28/643,636.80 = 129,540.24/x
  3. Step 3: Cross multiply
    429,035.28x = 643,636.80 × 129,540.24
  4. Step 4: Simplify right side
    429,035.28x = 83,376,865,544.83
  5. Step 5: Solve for x
    x = 83,376,865,544.83/429,035.28
  6. Step 6: Final answer
    x = 194,335.69

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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.