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Finding the Fourth Proportional to 65.76, 98.88 and 55.20

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Solution

The fourth proportional to 65.76, 98.88 and 55.20 is: 83.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.76 : 98.88 = 55.20 : x
  2. Step 2: Convert to fraction form
    65.76/98.88 = 55.20/x
  3. Step 3: Cross multiply
    65.76x = 98.88 × 55.20
  4. Step 4: Simplify right side
    65.76x = 5,458.18
  5. Step 5: Solve for x
    x = 5,458.18/65.76
  6. Step 6: Final answer
    x = 83.00

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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.