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Finding the Fourth Proportional to 129,342.48, 178,488.93 and 71,980.89

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Solution

The fourth proportional to 129,342.48, 178,488.93 and 71,980.89 is: 99,331.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,342.48 : 178,488.93 = 71,980.89 : x
  2. Step 2: Convert to fraction form
    129,342.48/178,488.93 = 71,980.89/x
  3. Step 3: Cross multiply
    129,342.48x = 178,488.93 × 71,980.89
  4. Step 4: Simplify right side
    129,342.48x = 12,847,792,036.55
  5. Step 5: Solve for x
    x = 12,847,792,036.55/129,342.48
  6. Step 6: Final answer
    x = 99,331.57

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1.5x scale

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.