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Finding the Fourth Proportional to 66,356.20, 99,687.90 and 45,620.20

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Solution

The fourth proportional to 66,356.20, 99,687.90 and 45,620.20 is: 68,535.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,356.20 : 99,687.90 = 45,620.20 : x
  2. Step 2: Convert to fraction form
    66,356.20/99,687.90 = 45,620.20/x
  3. Step 3: Cross multiply
    66,356.20x = 99,687.90 × 45,620.20
  4. Step 4: Simplify right side
    66,356.20x = 4,547,781,935.58
  5. Step 5: Solve for x
    x = 4,547,781,935.58/66,356.20
  6. Step 6: Final answer
    x = 68,535.90

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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.