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Finding the Fourth Proportional to 71.39, 98.55 and 45.20

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Solution

The fourth proportional to 71.39, 98.55 and 45.20 is: 62.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.39 : 98.55 = 45.20 : x
  2. Step 2: Convert to fraction form
    71.39/98.55 = 45.20/x
  3. Step 3: Cross multiply
    71.39x = 98.55 × 45.20
  4. Step 4: Simplify right side
    71.39x = 4,454.71
  5. Step 5: Solve for x
    x = 4,454.71/71.39
  6. Step 6: Final answer
    x = 62.40

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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.