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Finding the Fourth Proportional to 138,140.80, 207,364.80 and 85,609.60

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Solution

The fourth proportional to 138,140.80, 207,364.80 and 85,609.60 is: 128,509.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,140.80 : 207,364.80 = 85,609.60 : x
  2. Step 2: Convert to fraction form
    138,140.80/207,364.80 = 85,609.60/x
  3. Step 3: Cross multiply
    138,140.80x = 207,364.80 × 85,609.60
  4. Step 4: Simplify right side
    138,140.80x = 17,752,417,582.08
  5. Step 5: Solve for x
    x = 17,752,417,582.08/138,140.80
  6. Step 6: Final answer
    x = 128,509.59

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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.