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Finding the Fourth Proportional to 128,612.66, 177,486.72 and 71,253.20

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Solution

The fourth proportional to 128,612.66, 177,486.72 and 71,253.20 is: 98,330.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,612.66 : 177,486.72 = 71,253.20 : x
  2. Step 2: Convert to fraction form
    128,612.66/177,486.72 = 71,253.20/x
  3. Step 3: Cross multiply
    128,612.66x = 177,486.72 × 71,253.20
  4. Step 4: Simplify right side
    128,612.66x = 12,646,497,023.09
  5. Step 5: Solve for x
    x = 12,646,497,023.09/128,612.66
  6. Step 6: Final answer
    x = 98,330.11

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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.