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Finding the Fourth Proportional to 648.90, 895.19 and 386.87

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Solution

The fourth proportional to 648.90, 895.19 and 386.87 is: 533.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.90 : 895.19 = 386.87 : x
  2. Step 2: Convert to fraction form
    648.90/895.19 = 386.87/x
  3. Step 3: Cross multiply
    648.90x = 895.19 × 386.87
  4. Step 4: Simplify right side
    648.90x = 346,315.75
  5. Step 5: Solve for x
    x = 346,315.75/648.90
  6. Step 6: Final answer
    x = 533.70

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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.