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Finding the Fourth Proportional to 65,986.80, 98,980.20 and 61,321.20

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Solution

The fourth proportional to 65,986.80, 98,980.20 and 61,321.20 is: 91,981.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,986.80 : 98,980.20 = 61,321.20 : x
  2. Step 2: Convert to fraction form
    65,986.80/98,980.20 = 61,321.20/x
  3. Step 3: Cross multiply
    65,986.80x = 98,980.20 × 61,321.20
  4. Step 4: Simplify right side
    65,986.80x = 6,069,584,640.24
  5. Step 5: Solve for x
    x = 6,069,584,640.24/65,986.80
  6. Step 6: Final answer
    x = 91,981.80

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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.