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Finding the Fourth Proportional to 66,135.80, 99,203.70 and 45,140.60

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Solution

The fourth proportional to 66,135.80, 99,203.70 and 45,140.60 is: 67,710.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,135.80 : 99,203.70 = 45,140.60 : x
  2. Step 2: Convert to fraction form
    66,135.80/99,203.70 = 45,140.60/x
  3. Step 3: Cross multiply
    66,135.80x = 99,203.70 × 45,140.60
  4. Step 4: Simplify right side
    66,135.80x = 4,478,114,540.22
  5. Step 5: Solve for x
    x = 4,478,114,540.22/66,135.80
  6. Step 6: Final answer
    x = 67,710.90

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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.