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Finding the Fourth Proportional to 648.75, 895.28 and 386.92

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Solution

The fourth proportional to 648.75, 895.28 and 386.92 is: 533.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.75 : 895.28 = 386.92 : x
  2. Step 2: Convert to fraction form
    648.75/895.28 = 386.92/x
  3. Step 3: Cross multiply
    648.75x = 895.28 × 386.92
  4. Step 4: Simplify right side
    648.75x = 346,397.56
  5. Step 5: Solve for x
    x = 346,397.56/648.75
  6. Step 6: Final answer
    x = 533.95

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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.