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Finding the Fourth Proportional to 71.55, 98.87 and 64.76

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Solution

The fourth proportional to 71.55, 98.87 and 64.76 is: 89.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.55 : 98.87 = 64.76 : x
  2. Step 2: Convert to fraction form
    71.55/98.87 = 64.76/x
  3. Step 3: Cross multiply
    71.55x = 98.87 × 64.76
  4. Step 4: Simplify right side
    71.55x = 6,402.00
  5. Step 5: Solve for x
    x = 6,402.00/71.55
  6. Step 6: Final answer
    x = 89.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.