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Finding the Fourth Proportional to 100,553.68, 138,828.54 and 89,779.96

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Solution

The fourth proportional to 100,553.68, 138,828.54 and 89,779.96 is: 123,953.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,553.68 : 138,828.54 = 89,779.96 : x
  2. Step 2: Convert to fraction form
    100,553.68/138,828.54 = 89,779.96/x
  3. Step 3: Cross multiply
    100,553.68x = 138,828.54 × 89,779.96
  4. Step 4: Simplify right side
    100,553.68x = 12,464,020,768.06
  5. Step 5: Solve for x
    x = 12,464,020,768.06/100,553.68
  6. Step 6: Final answer
    x = 123,953.90

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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.