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Finding the Fourth Proportional to 111,428.35, 153,754.86 and 63,672.47

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Solution

The fourth proportional to 111,428.35, 153,754.86 and 63,672.47 is: 87,858.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,428.35 : 153,754.86 = 63,672.47 : x
  2. Step 2: Convert to fraction form
    111,428.35/153,754.86 = 63,672.47/x
  3. Step 3: Cross multiply
    111,428.35x = 153,754.86 × 63,672.47
  4. Step 4: Simplify right side
    111,428.35x = 9,789,951,710.70
  5. Step 5: Solve for x
    x = 9,789,951,710.70/111,428.35
  6. Step 6: Final answer
    x = 87,858.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.