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Finding the Fourth Proportional to 51.32, 70.81 and 30.59

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Solution

The fourth proportional to 51.32, 70.81 and 30.59 is: 42.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.32 : 70.81 = 30.59 : x
  2. Step 2: Convert to fraction form
    51.32/70.81 = 30.59/x
  3. Step 3: Cross multiply
    51.32x = 70.81 × 30.59
  4. Step 4: Simplify right side
    51.32x = 2,166.08
  5. Step 5: Solve for x
    x = 2,166.08/51.32
  6. Step 6: Final answer
    x = 42.21

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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.