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Finding the Fourth Proportional to 76.49, 105.57 and 45.40

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Solution

The fourth proportional to 76.49, 105.57 and 45.40 is: 62.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.49 : 105.57 = 45.40 : x
  2. Step 2: Convert to fraction form
    76.49/105.57 = 45.40/x
  3. Step 3: Cross multiply
    76.49x = 105.57 × 45.40
  4. Step 4: Simplify right side
    76.49x = 4,793.11
  5. Step 5: Solve for x
    x = 4,793.11/76.49
  6. Step 6: Final answer
    x = 62.66

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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.