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Finding the Fourth Proportional to 67,218.60, 100,746.90 and 39,084.60

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Solution

The fourth proportional to 67,218.60, 100,746.90 and 39,084.60 is: 58,579.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,218.60 : 100,746.90 = 39,084.60 : x
  2. Step 2: Convert to fraction form
    67,218.60/100,746.90 = 39,084.60/x
  3. Step 3: Cross multiply
    67,218.60x = 100,746.90 × 39,084.60
  4. Step 4: Simplify right side
    67,218.60x = 3,937,652,287.74
  5. Step 5: Solve for x
    x = 3,937,652,287.74/67,218.60
  6. Step 6: Final answer
    x = 58,579.80

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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.