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Finding the Fourth Proportional to 900.55, 1,242.68 and 502.17

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Solution

The fourth proportional to 900.55, 1,242.68 and 502.17 is: 692.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.55 : 1,242.68 = 502.17 : x
  2. Step 2: Convert to fraction form
    900.55/1,242.68 = 502.17/x
  3. Step 3: Cross multiply
    900.55x = 1,242.68 × 502.17
  4. Step 4: Simplify right side
    900.55x = 624,034.10
  5. Step 5: Solve for x
    x = 624,034.10/900.55
  6. Step 6: Final answer
    x = 692.95

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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.