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Finding the Fourth Proportional to 129,159, 178,239.42 and 72,570.42

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Solution

The fourth proportional to 129,159, 178,239.42 and 72,570.42 is: 100,147.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,159 : 178,239.42 = 72,570.42 : x
  2. Step 2: Convert to fraction form
    129,159/178,239.42 = 72,570.42/x
  3. Step 3: Cross multiply
    129,159x = 178,239.42 × 72,570.42
  4. Step 4: Simplify right side
    129,159x = 12,934,909,569.96
  5. Step 5: Solve for x
    x = 12,934,909,569.96/129,159
  6. Step 6: Final answer
    x = 100,147.18

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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.