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Finding the Fourth Proportional to 138,152.80, 207,382.80 and 85,621.60

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Solution

The fourth proportional to 138,152.80, 207,382.80 and 85,621.60 is: 128,527.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,152.80 : 207,382.80 = 85,621.60 : x
  2. Step 2: Convert to fraction form
    138,152.80/207,382.80 = 85,621.60/x
  3. Step 3: Cross multiply
    138,152.80x = 207,382.80 × 85,621.60
  4. Step 4: Simplify right side
    138,152.80x = 17,756,447,148.48
  5. Step 5: Solve for x
    x = 17,756,447,148.48/138,152.80
  6. Step 6: Final answer
    x = 128,527.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.