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Finding the Fourth Proportional to 545.40, 816.90 and 422.70

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Solution

The fourth proportional to 545.40, 816.90 and 422.70 is: 633.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    545.40 : 816.90 = 422.70 : x
  2. Step 2: Convert to fraction form
    545.40/816.90 = 422.70/x
  3. Step 3: Cross multiply
    545.40x = 816.90 × 422.70
  4. Step 4: Simplify right side
    545.40x = 345,303.63
  5. Step 5: Solve for x
    x = 345,303.63/545.40
  6. Step 6: Final answer
    x = 633.12

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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.