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Finding the Fourth Proportional to 125.70, 173.31 and 90.67

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Solution

The fourth proportional to 125.70, 173.31 and 90.67 is: 125.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.70 : 173.31 = 90.67 : x
  2. Step 2: Convert to fraction form
    125.70/173.31 = 90.67/x
  3. Step 3: Cross multiply
    125.70x = 173.31 × 90.67
  4. Step 4: Simplify right side
    125.70x = 15,714.02
  5. Step 5: Solve for x
    x = 15,714.02/125.70
  6. Step 6: Final answer
    x = 125.01

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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.