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Finding the Fourth Proportional to 125.78, 188.70 and 64.96

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Solution

The fourth proportional to 125.78, 188.70 and 64.96 is: 97.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.78 : 188.70 = 64.96 : x
  2. Step 2: Convert to fraction form
    125.78/188.70 = 64.96/x
  3. Step 3: Cross multiply
    125.78x = 188.70 × 64.96
  4. Step 4: Simplify right side
    125.78x = 12,257.95
  5. Step 5: Solve for x
    x = 12,257.95/125.78
  6. Step 6: Final answer
    x = 97.46

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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.