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Finding the Fourth Proportional to 65,720.80, 98,581.20 and 40,918.60

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Solution

The fourth proportional to 65,720.80, 98,581.20 and 40,918.60 is: 61,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.80 : 98,581.20 = 40,918.60 : x
  2. Step 2: Convert to fraction form
    65,720.80/98,581.20 = 40,918.60/x
  3. Step 3: Cross multiply
    65,720.80x = 98,581.20 × 40,918.60
  4. Step 4: Simplify right side
    65,720.80x = 4,033,804,690.32
  5. Step 5: Solve for x
    x = 4,033,804,690.32/65,720.80
  6. Step 6: Final answer
    x = 61,377.90

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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.