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Finding the Fourth Proportional to 45.30, 67.40 and 45.15

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Solution

The fourth proportional to 45.30, 67.40 and 45.15 is: 67.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.30 : 67.40 = 45.15 : x
  2. Step 2: Convert to fraction form
    45.30/67.40 = 45.15/x
  3. Step 3: Cross multiply
    45.30x = 67.40 × 45.15
  4. Step 4: Simplify right side
    45.30x = 3,042.77
  5. Step 5: Solve for x
    x = 3,042.77/45.30
  6. Step 6: Final answer
    x = 67.18

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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.