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Finding the Fourth Proportional to 66,230.80, 99,216.60 and 39,857.20

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Solution

The fourth proportional to 66,230.80, 99,216.60 and 39,857.20 is: 59,707.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,230.80 : 99,216.60 = 39,857.20 : x
  2. Step 2: Convert to fraction form
    66,230.80/99,216.60 = 39,857.20/x
  3. Step 3: Cross multiply
    66,230.80x = 99,216.60 × 39,857.20
  4. Step 4: Simplify right side
    66,230.80x = 3,954,495,869.52
  5. Step 5: Solve for x
    x = 3,954,495,869.52/66,230.80
  6. Step 6: Final answer
    x = 59,707.81

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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.