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Finding the Fourth Proportional to 66,403.80, 99,540.90 and 59,405.40

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Solution

The fourth proportional to 66,403.80, 99,540.90 and 59,405.40 is: 89,050.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,403.80 : 99,540.90 = 59,405.40 : x
  2. Step 2: Convert to fraction form
    66,403.80/99,540.90 = 59,405.40/x
  3. Step 3: Cross multiply
    66,403.80x = 99,540.90 × 59,405.40
  4. Step 4: Simplify right side
    66,403.80x = 5,913,266,980.86
  5. Step 5: Solve for x
    x = 5,913,266,980.86/66,403.80
  6. Step 6: Final answer
    x = 89,050.13

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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.