Home / 429,054.10-643,685.20-129,516.78

Finding the Fourth Proportional to 429,054.10, 643,685.20 and 129,516.78

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Solution

The fourth proportional to 429,054.10, 643,685.20 and 129,516.78 is: 194,306.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,054.10 : 643,685.20 = 129,516.78 : x
  2. Step 2: Convert to fraction form
    429,054.10/643,685.20 = 129,516.78/x
  3. Step 3: Cross multiply
    429,054.10x = 643,685.20 × 129,516.78
  4. Step 4: Simplify right side
    429,054.10x = 83,368,036,527.68
  5. Step 5: Solve for x
    x = 83,368,036,527.68/429,054.10
  6. Step 6: Final answer
    x = 194,306.59

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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.