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Finding the Fourth Proportional to 71.00, 97.85 and 65.19

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Solution

The fourth proportional to 71.00, 97.85 and 65.19 is: 89.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.00 : 97.85 = 65.19 : x
  2. Step 2: Convert to fraction form
    71.00/97.85 = 65.19/x
  3. Step 3: Cross multiply
    71.00x = 97.85 × 65.19
  4. Step 4: Simplify right side
    71.00x = 6,378.52
  5. Step 5: Solve for x
    x = 6,378.52/71.00
  6. Step 6: Final answer
    x = 89.84

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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.