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Finding the Fourth Proportional to 48.61, 72.50 and 45.55

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Solution

The fourth proportional to 48.61, 72.50 and 45.55 is: 67.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.61 : 72.50 = 45.55 : x
  2. Step 2: Convert to fraction form
    48.61/72.50 = 45.55/x
  3. Step 3: Cross multiply
    48.61x = 72.50 × 45.55
  4. Step 4: Simplify right side
    48.61x = 3,302.38
  5. Step 5: Solve for x
    x = 3,302.38/48.61
  6. Step 6: Final answer
    x = 67.94

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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.