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Finding the Fourth Proportional to 71.35, 98.47 and 42.23

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Solution

The fourth proportional to 71.35, 98.47 and 42.23 is: 58.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.35 : 98.47 = 42.23 : x
  2. Step 2: Convert to fraction form
    71.35/98.47 = 42.23/x
  3. Step 3: Cross multiply
    71.35x = 98.47 × 42.23
  4. Step 4: Simplify right side
    71.35x = 4,158.39
  5. Step 5: Solve for x
    x = 4,158.39/71.35
  6. Step 6: Final answer
    x = 58.28

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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.