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Finding the Fourth Proportional to 64.30, 88.65 and 45.85

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Solution

The fourth proportional to 64.30, 88.65 and 45.85 is: 63.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.30 : 88.65 = 45.85 : x
  2. Step 2: Convert to fraction form
    64.30/88.65 = 45.85/x
  3. Step 3: Cross multiply
    64.30x = 88.65 × 45.85
  4. Step 4: Simplify right side
    64.30x = 4,064.38
  5. Step 5: Solve for x
    x = 4,064.38/64.30
  6. Step 6: Final answer
    x = 63.21

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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.