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Finding the Fourth Proportional to 354.57, 531.74 and 123.40

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Solution

The fourth proportional to 354.57, 531.74 and 123.40 is: 185.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.57 : 531.74 = 123.40 : x
  2. Step 2: Convert to fraction form
    354.57/531.74 = 123.40/x
  3. Step 3: Cross multiply
    354.57x = 531.74 × 123.40
  4. Step 4: Simplify right side
    354.57x = 65,616.10
  5. Step 5: Solve for x
    x = 65,616.10/354.57
  6. Step 6: Final answer
    x = 185.06

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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.