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Finding the Fourth Proportional to 64.64, 97.50 and 61.76

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Solution

The fourth proportional to 64.64, 97.50 and 61.76 is: 93.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.64 : 97.50 = 61.76 : x
  2. Step 2: Convert to fraction form
    64.64/97.50 = 61.76/x
  3. Step 3: Cross multiply
    64.64x = 97.50 × 61.76
  4. Step 4: Simplify right side
    64.64x = 6,021.60
  5. Step 5: Solve for x
    x = 6,021.60/64.64
  6. Step 6: Final answer
    x = 93.16

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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.