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Finding the Fourth Proportional to 907.57, 1,252.71 and 613.21

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Solution

The fourth proportional to 907.57, 1,252.71 and 613.21 is: 846.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.57 : 1,252.71 = 613.21 : x
  2. Step 2: Convert to fraction form
    907.57/1,252.71 = 613.21/x
  3. Step 3: Cross multiply
    907.57x = 1,252.71 × 613.21
  4. Step 4: Simplify right side
    907.57x = 768,174.30
  5. Step 5: Solve for x
    x = 768,174.30/907.57
  6. Step 6: Final answer
    x = 846.41

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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.