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Finding the Fourth Proportional to 74,356.60, 111,210.90 and 66,515.80

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Solution

The fourth proportional to 74,356.60, 111,210.90 and 66,515.80 is: 99,483.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,356.60 : 111,210.90 = 66,515.80 : x
  2. Step 2: Convert to fraction form
    74,356.60/111,210.90 = 66,515.80/x
  3. Step 3: Cross multiply
    74,356.60x = 111,210.90 × 66,515.80
  4. Step 4: Simplify right side
    74,356.60x = 7,397,281,982.22
  5. Step 5: Solve for x
    x = 7,397,281,982.22/74,356.60
  6. Step 6: Final answer
    x = 99,483.87

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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.