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Finding the Fourth Proportional to 51.12, 70.46 and 42.42

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Solution

The fourth proportional to 51.12, 70.46 and 42.42 is: 58.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.12 : 70.46 = 42.42 : x
  2. Step 2: Convert to fraction form
    51.12/70.46 = 42.42/x
  3. Step 3: Cross multiply
    51.12x = 70.46 × 42.42
  4. Step 4: Simplify right side
    51.12x = 2,988.91
  5. Step 5: Solve for x
    x = 2,988.91/51.12
  6. Step 6: Final answer
    x = 58.47

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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.