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Finding the Fourth Proportional to 58.43, 80.58 and 39.98

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Solution

The fourth proportional to 58.43, 80.58 and 39.98 is: 55.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.43 : 80.58 = 39.98 : x
  2. Step 2: Convert to fraction form
    58.43/80.58 = 39.98/x
  3. Step 3: Cross multiply
    58.43x = 80.58 × 39.98
  4. Step 4: Simplify right side
    58.43x = 3,221.39
  5. Step 5: Solve for x
    x = 3,221.39/58.43
  6. Step 6: Final answer
    x = 55.13

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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.