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Finding the Fourth Proportional to 129,707.34, 178,992.54 and 72,348.36

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Solution

The fourth proportional to 129,707.34, 178,992.54 and 72,348.36 is: 99,838.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,707.34 : 178,992.54 = 72,348.36 : x
  2. Step 2: Convert to fraction form
    129,707.34/178,992.54 = 72,348.36/x
  3. Step 3: Cross multiply
    129,707.34x = 178,992.54 × 72,348.36
  4. Step 4: Simplify right side
    129,707.34x = 12,949,816,721.23
  5. Step 5: Solve for x
    x = 12,949,816,721.23/129,707.34
  6. Step 6: Final answer
    x = 99,838.73

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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.