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Finding the Fourth Proportional to 812.18, 1,121.02 and 501.50

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Solution

The fourth proportional to 812.18, 1,121.02 and 501.50 is: 692.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.18 : 1,121.02 = 501.50 : x
  2. Step 2: Convert to fraction form
    812.18/1,121.02 = 501.50/x
  3. Step 3: Cross multiply
    812.18x = 1,121.02 × 501.50
  4. Step 4: Simplify right side
    812.18x = 562,191.53
  5. Step 5: Solve for x
    x = 562,191.53/812.18
  6. Step 6: Final answer
    x = 692.20

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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.