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Finding the Fourth Proportional to 907.91, 1,252.91 and 493.91

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Solution

The fourth proportional to 907.91, 1,252.91 and 493.91 is: 681.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.91 : 1,252.91 = 493.91 : x
  2. Step 2: Convert to fraction form
    907.91/1,252.91 = 493.91/x
  3. Step 3: Cross multiply
    907.91x = 1,252.91 × 493.91
  4. Step 4: Simplify right side
    907.91x = 618,824.78
  5. Step 5: Solve for x
    x = 618,824.78/907.91
  6. Step 6: Final answer
    x = 681.59

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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.