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Finding the Fourth Proportional to 649.21, 895.91 and 387.17

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Solution

The fourth proportional to 649.21, 895.91 and 387.17 is: 534.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.21 : 895.91 = 387.17 : x
  2. Step 2: Convert to fraction form
    649.21/895.91 = 387.17/x
  3. Step 3: Cross multiply
    649.21x = 895.91 × 387.17
  4. Step 4: Simplify right side
    649.21x = 346,869.47
  5. Step 5: Solve for x
    x = 346,869.47/649.21
  6. Step 6: Final answer
    x = 534.29

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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.