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Finding the Fourth Proportional to 128,115.95, 176,786.60 and 74,390.47

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Solution

The fourth proportional to 128,115.95, 176,786.60 and 74,390.47 is: 102,651.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,115.95 : 176,786.60 = 74,390.47 : x
  2. Step 2: Convert to fraction form
    128,115.95/176,786.60 = 74,390.47/x
  3. Step 3: Cross multiply
    128,115.95x = 176,786.60 × 74,390.47
  4. Step 4: Simplify right side
    128,115.95x = 13,151,237,449.78
  5. Step 5: Solve for x
    x = 13,151,237,449.78/128,115.95
  6. Step 6: Final answer
    x = 102,651.06

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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.