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Finding the Fourth Proportional to 51.65, 71.30 and 45.21

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Solution

The fourth proportional to 51.65, 71.30 and 45.21 is: 62.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.65 : 71.30 = 45.21 : x
  2. Step 2: Convert to fraction form
    51.65/71.30 = 45.21/x
  3. Step 3: Cross multiply
    51.65x = 71.30 × 45.21
  4. Step 4: Simplify right side
    51.65x = 3,223.59
  5. Step 5: Solve for x
    x = 3,223.59/51.65
  6. Step 6: Final answer
    x = 62.42

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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.