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Finding the Fourth Proportional to 501.49, 692.11 and 315.12

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Solution

The fourth proportional to 501.49, 692.11 and 315.12 is: 434.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.49 : 692.11 = 315.12 : x
  2. Step 2: Convert to fraction form
    501.49/692.11 = 315.12/x
  3. Step 3: Cross multiply
    501.49x = 692.11 × 315.12
  4. Step 4: Simplify right side
    501.49x = 218,097.70
  5. Step 5: Solve for x
    x = 218,097.70/501.49
  6. Step 6: Final answer
    x = 434.90

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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.