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Finding the Fourth Proportional to 65.16, 98.12 and 61.20

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Solution

The fourth proportional to 65.16, 98.12 and 61.20 is: 92.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.16 : 98.12 = 61.20 : x
  2. Step 2: Convert to fraction form
    65.16/98.12 = 61.20/x
  3. Step 3: Cross multiply
    65.16x = 98.12 × 61.20
  4. Step 4: Simplify right side
    65.16x = 6,004.94
  5. Step 5: Solve for x
    x = 6,004.94/65.16
  6. Step 6: Final answer
    x = 92.16

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.