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Finding the Fourth Proportional to 422.50, 581.70 and 403

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Solution

The fourth proportional to 422.50, 581.70 and 403 is: 554.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.50 : 581.70 = 403 : x
  2. Step 2: Convert to fraction form
    422.50/581.70 = 403/x
  3. Step 3: Cross multiply
    422.50x = 581.70 × 403
  4. Step 4: Simplify right side
    422.50x = 234,425.10
  5. Step 5: Solve for x
    x = 234,425.10/422.50
  6. Step 6: Final answer
    x = 554.85

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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.