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Finding the Fourth Proportional to 66,219.20, 99,328.80 and 61,812.80

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Solution

The fourth proportional to 66,219.20, 99,328.80 and 61,812.80 is: 92,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,219.20 : 99,328.80 = 61,812.80 : x
  2. Step 2: Convert to fraction form
    66,219.20/99,328.80 = 61,812.80/x
  3. Step 3: Cross multiply
    66,219.20x = 99,328.80 × 61,812.80
  4. Step 4: Simplify right side
    66,219.20x = 6,139,791,248.64
  5. Step 5: Solve for x
    x = 6,139,791,248.64/66,219.20
  6. Step 6: Final answer
    x = 92,719.20

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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.