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Finding the Fourth Proportional to 129,051.50, 178,119.51 and 71,710.49

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Solution

The fourth proportional to 129,051.50, 178,119.51 and 71,710.49 is: 98,976.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,051.50 : 178,119.51 = 71,710.49 : x
  2. Step 2: Convert to fraction form
    129,051.50/178,119.51 = 71,710.49/x
  3. Step 3: Cross multiply
    129,051.50x = 178,119.51 × 71,710.49
  4. Step 4: Simplify right side
    129,051.50x = 12,773,037,340.66
  5. Step 5: Solve for x
    x = 12,773,037,340.66/129,051.50
  6. Step 6: Final answer
    x = 98,976.28

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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.