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Finding the Fourth Proportional to 128,257.60, 177,002.40 and 74,516.80

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Solution

The fourth proportional to 128,257.60, 177,002.40 and 74,516.80 is: 102,837.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,257.60 : 177,002.40 = 74,516.80 : x
  2. Step 2: Convert to fraction form
    128,257.60/177,002.40 = 74,516.80/x
  3. Step 3: Cross multiply
    128,257.60x = 177,002.40 × 74,516.80
  4. Step 4: Simplify right side
    128,257.60x = 13,189,652,440.32
  5. Step 5: Solve for x
    x = 13,189,652,440.32/128,257.60
  6. Step 6: Final answer
    x = 102,837.20

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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.