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Finding the Fourth Proportional to 128,650.95, 177,533.10 and 71,291.14

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Solution

The fourth proportional to 128,650.95, 177,533.10 and 71,291.14 is: 98,378.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,650.95 : 177,533.10 = 71,291.14 : x
  2. Step 2: Convert to fraction form
    128,650.95/177,533.10 = 71,291.14/x
  3. Step 3: Cross multiply
    128,650.95x = 177,533.10 × 71,291.14
  4. Step 4: Simplify right side
    128,650.95x = 12,656,536,642.90
  5. Step 5: Solve for x
    x = 12,656,536,642.90/128,650.95
  6. Step 6: Final answer
    x = 98,378.88

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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.