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Finding the Fourth Proportional to 100,569.88, 138,779.76 and 55,239.04

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Solution

The fourth proportional to 100,569.88, 138,779.76 and 55,239.04 is: 76,226.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,569.88 : 138,779.76 = 55,239.04 : x
  2. Step 2: Convert to fraction form
    100,569.88/138,779.76 = 55,239.04/x
  3. Step 3: Cross multiply
    100,569.88x = 138,779.76 × 55,239.04
  4. Step 4: Simplify right side
    100,569.88x = 7,666,060,713.83
  5. Step 5: Solve for x
    x = 7,666,060,713.83/100,569.88
  6. Step 6: Final answer
    x = 76,226.21

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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.