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Finding the Fourth Proportional to 128,463.90, 177,276.54 and 71,105.58

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Solution

The fourth proportional to 128,463.90, 177,276.54 and 71,105.58 is: 98,123.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,463.90 : 177,276.54 = 71,105.58 : x
  2. Step 2: Convert to fraction form
    128,463.90/177,276.54 = 71,105.58/x
  3. Step 3: Cross multiply
    128,463.90x = 177,276.54 × 71,105.58
  4. Step 4: Simplify right side
    128,463.90x = 12,605,351,197.09
  5. Step 5: Solve for x
    x = 12,605,351,197.09/128,463.90
  6. Step 6: Final answer
    x = 98,123.68

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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.