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Finding the Fourth Proportional to 61.32, 91.80 and 45

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Solution

The fourth proportional to 61.32, 91.80 and 45 is: 67.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.32 : 91.80 = 45 : x
  2. Step 2: Convert to fraction form
    61.32/91.80 = 45/x
  3. Step 3: Cross multiply
    61.32x = 91.80 × 45
  4. Step 4: Simplify right side
    61.32x = 4,131
  5. Step 5: Solve for x
    x = 4,131/61.32
  6. Step 6: Final answer
    x = 67.37

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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.