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Finding the Fourth Proportional to 58.94, 81.30 and 39.50

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Solution

The fourth proportional to 58.94, 81.30 and 39.50 is: 54.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.94 : 81.30 = 39.50 : x
  2. Step 2: Convert to fraction form
    58.94/81.30 = 39.50/x
  3. Step 3: Cross multiply
    58.94x = 81.30 × 39.50
  4. Step 4: Simplify right side
    58.94x = 3,211.35
  5. Step 5: Solve for x
    x = 3,211.35/58.94
  6. Step 6: Final answer
    x = 54.49

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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.