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Finding the Fourth Proportional to 64.57, 96.42 and 53.18

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Solution

The fourth proportional to 64.57, 96.42 and 53.18 is: 79.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.57 : 96.42 = 53.18 : x
  2. Step 2: Convert to fraction form
    64.57/96.42 = 53.18/x
  3. Step 3: Cross multiply
    64.57x = 96.42 × 53.18
  4. Step 4: Simplify right side
    64.57x = 5,127.52
  5. Step 5: Solve for x
    x = 5,127.52/64.57
  6. Step 6: Final answer
    x = 79.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.