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Finding the Fourth Proportional to 66,216.55, 99,160.80 and 42,487.60

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Solution

The fourth proportional to 66,216.55, 99,160.80 and 42,487.60 is: 63,626.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,216.55 : 99,160.80 = 42,487.60 : x
  2. Step 2: Convert to fraction form
    66,216.55/99,160.80 = 42,487.60/x
  3. Step 3: Cross multiply
    66,216.55x = 99,160.80 × 42,487.60
  4. Step 4: Simplify right side
    66,216.55x = 4,213,104,406.08
  5. Step 5: Solve for x
    x = 4,213,104,406.08/66,216.55
  6. Step 6: Final answer
    x = 63,626.15

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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.