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Finding the Fourth Proportional to 51.64, 71.31 and 42.49

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Solution

The fourth proportional to 51.64, 71.31 and 42.49 is: 58.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.64 : 71.31 = 42.49 : x
  2. Step 2: Convert to fraction form
    51.64/71.31 = 42.49/x
  3. Step 3: Cross multiply
    51.64x = 71.31 × 42.49
  4. Step 4: Simplify right side
    51.64x = 3,030.21
  5. Step 5: Solve for x
    x = 3,030.21/51.64
  6. Step 6: Final answer
    x = 58.68

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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.