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Finding the Fourth Proportional to 78, 116.98 and 32.39

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Solution

The fourth proportional to 78, 116.98 and 32.39 is: 48.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    78 : 116.98 = 32.39 : x
  2. Step 2: Convert to fraction form
    78/116.98 = 32.39/x
  3. Step 3: Cross multiply
    78x = 116.98 × 32.39
  4. Step 4: Simplify right side
    78x = 3,788.98
  5. Step 5: Solve for x
    x = 3,788.98/78
  6. Step 6: Final answer
    x = 48.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.