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Finding the Fourth Proportional to 128,463.20, 177,314.88 and 74,758.64

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Solution

The fourth proportional to 128,463.20, 177,314.88 and 74,758.64 is: 103,187.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,463.20 : 177,314.88 = 74,758.64 : x
  2. Step 2: Convert to fraction form
    128,463.20/177,314.88 = 74,758.64/x
  3. Step 3: Cross multiply
    128,463.20x = 177,314.88 × 74,758.64
  4. Step 4: Simplify right side
    128,463.20x = 13,255,819,280.56
  5. Step 5: Solve for x
    x = 13,255,819,280.56/128,463.20
  6. Step 6: Final answer
    x = 103,187.68

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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.