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Finding the Fourth Proportional to 151,728.79, 209,385.72 and 84,660.79

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Solution

The fourth proportional to 151,728.79, 209,385.72 and 84,660.79 is: 116,831.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,728.79 : 209,385.72 = 84,660.79 : x
  2. Step 2: Convert to fraction form
    151,728.79/209,385.72 = 84,660.79/x
  3. Step 3: Cross multiply
    151,728.79x = 209,385.72 × 84,660.79
  4. Step 4: Simplify right side
    151,728.79x = 17,726,759,753.34
  5. Step 5: Solve for x
    x = 17,726,759,753.34/151,728.79
  6. Step 6: Final answer
    x = 116,831.88

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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.