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Finding the Fourth Proportional to 45.18, 62.42 and 30.69

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Solution

The fourth proportional to 45.18, 62.42 and 30.69 is: 42.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.18 : 62.42 = 30.69 : x
  2. Step 2: Convert to fraction form
    45.18/62.42 = 30.69/x
  3. Step 3: Cross multiply
    45.18x = 62.42 × 30.69
  4. Step 4: Simplify right side
    45.18x = 1,915.52
  5. Step 5: Solve for x
    x = 1,915.52/45.18
  6. Step 6: Final answer
    x = 42.40

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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.