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Finding the Fourth Proportional to 138,348.10, 207,716.55 and 85,860.10

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Solution

The fourth proportional to 138,348.10, 207,716.55 and 85,860.10 is: 128,910.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,348.10 : 207,716.55 = 85,860.10 : x
  2. Step 2: Convert to fraction form
    138,348.10/207,716.55 = 85,860.10/x
  3. Step 3: Cross multiply
    138,348.10x = 207,716.55 × 85,860.10
  4. Step 4: Simplify right side
    138,348.10x = 17,834,563,754.66
  5. Step 5: Solve for x
    x = 17,834,563,754.66/138,348.10
  6. Step 6: Final answer
    x = 128,910.80

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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.