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Finding the Fourth Proportional to 426,754.32, 640,123.20 and 127,437.72

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Solution

The fourth proportional to 426,754.32, 640,123.20 and 127,437.72 is: 191,154.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,754.32 : 640,123.20 = 127,437.72 : x
  2. Step 2: Convert to fraction form
    426,754.32/640,123.20 = 127,437.72/x
  3. Step 3: Cross multiply
    426,754.32x = 640,123.20 × 127,437.72
  4. Step 4: Simplify right side
    426,754.32x = 81,575,841,127.10
  5. Step 5: Solve for x
    x = 81,575,841,127.10/426,754.32
  6. Step 6: Final answer
    x = 191,154.11

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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.