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Finding the Fourth Proportional to 128,090.90, 176,758.10 and 71,505.86

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Solution

The fourth proportional to 128,090.90, 176,758.10 and 71,505.86 is: 98,673.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,090.90 : 176,758.10 = 71,505.86 : x
  2. Step 2: Convert to fraction form
    128,090.90/176,758.10 = 71,505.86/x
  3. Step 3: Cross multiply
    128,090.90x = 176,758.10 × 71,505.86
  4. Step 4: Simplify right side
    128,090.90x = 12,639,239,952.47
  5. Step 5: Solve for x
    x = 12,639,239,952.47/128,090.90
  6. Step 6: Final answer
    x = 98,673.99

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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.