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Finding the Fourth Proportional to 147,642.10, 221,463.15 and 81,286.90

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Solution

The fourth proportional to 147,642.10, 221,463.15 and 81,286.90 is: 121,930.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,642.10 : 221,463.15 = 81,286.90 : x
  2. Step 2: Convert to fraction form
    147,642.10/221,463.15 = 81,286.90/x
  3. Step 3: Cross multiply
    147,642.10x = 221,463.15 × 81,286.90
  4. Step 4: Simplify right side
    147,642.10x = 18,002,052,927.74
  5. Step 5: Solve for x
    x = 18,002,052,927.74/147,642.10
  6. Step 6: Final answer
    x = 121,930.35

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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.