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Finding the Fourth Proportional to 49.61, 74.30 and 45.05

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Solution

The fourth proportional to 49.61, 74.30 and 45.05 is: 67.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.61 : 74.30 = 45.05 : x
  2. Step 2: Convert to fraction form
    49.61/74.30 = 45.05/x
  3. Step 3: Cross multiply
    49.61x = 74.30 × 45.05
  4. Step 4: Simplify right side
    49.61x = 3,347.18
  5. Step 5: Solve for x
    x = 3,347.18/49.61
  6. Step 6: Final answer
    x = 67.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.