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Finding the Fourth Proportional to 129,015.01, 178,044.87 and 71,655.03

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Solution

The fourth proportional to 129,015.01, 178,044.87 and 71,655.03 is: 98,886.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,015.01 : 178,044.87 = 71,655.03 : x
  2. Step 2: Convert to fraction form
    129,015.01/178,044.87 = 71,655.03/x
  3. Step 3: Cross multiply
    129,015.01x = 178,044.87 × 71,655.03
  4. Step 4: Simplify right side
    129,015.01x = 12,757,810,501.20
  5. Step 5: Solve for x
    x = 12,757,810,501.20/129,015.01
  6. Step 6: Final answer
    x = 98,886.25

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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.