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Finding the Fourth Proportional to 51.33, 70.53 and 42.15

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Solution

The fourth proportional to 51.33, 70.53 and 42.15 is: 57.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.33 : 70.53 = 42.15 : x
  2. Step 2: Convert to fraction form
    51.33/70.53 = 42.15/x
  3. Step 3: Cross multiply
    51.33x = 70.53 × 42.15
  4. Step 4: Simplify right side
    51.33x = 2,972.84
  5. Step 5: Solve for x
    x = 2,972.84/51.33
  6. Step 6: Final answer
    x = 57.92

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.