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Finding the Fourth Proportional to 66,447.20, 99,621.20 and 40,146.40

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Solution

The fourth proportional to 66,447.20, 99,621.20 and 40,146.40 is: 60,189.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,447.20 : 99,621.20 = 40,146.40 : x
  2. Step 2: Convert to fraction form
    66,447.20/99,621.20 = 40,146.40/x
  3. Step 3: Cross multiply
    66,447.20x = 99,621.20 × 40,146.40
  4. Step 4: Simplify right side
    66,447.20x = 3,999,432,543.68
  5. Step 5: Solve for x
    x = 3,999,432,543.68/66,447.20
  6. Step 6: Final answer
    x = 60,189.63

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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.