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Finding the Fourth Proportional to 138,323.20, 207,484.80 and 85,835.20

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Solution

The fourth proportional to 138,323.20, 207,484.80 and 85,835.20 is: 128,752.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,323.20 : 207,484.80 = 85,835.20 : x
  2. Step 2: Convert to fraction form
    138,323.20/207,484.80 = 85,835.20/x
  3. Step 3: Cross multiply
    138,323.20x = 207,484.80 × 85,835.20
  4. Step 4: Simplify right side
    138,323.20x = 17,809,499,304.96
  5. Step 5: Solve for x
    x = 17,809,499,304.96/138,323.20
  6. Step 6: Final answer
    x = 128,752.80

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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.