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Finding the Fourth Proportional to 64.49, 89.02 and 39.93

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Solution

The fourth proportional to 64.49, 89.02 and 39.93 is: 55.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.49 : 89.02 = 39.93 : x
  2. Step 2: Convert to fraction form
    64.49/89.02 = 39.93/x
  3. Step 3: Cross multiply
    64.49x = 89.02 × 39.93
  4. Step 4: Simplify right side
    64.49x = 3,554.47
  5. Step 5: Solve for x
    x = 3,554.47/64.49
  6. Step 6: Final answer
    x = 55.12

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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.