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Finding the Fourth Proportional to 648.84, 895.42 and 386.88

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Solution

The fourth proportional to 648.84, 895.42 and 386.88 is: 533.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.84 : 895.42 = 386.88 : x
  2. Step 2: Convert to fraction form
    648.84/895.42 = 386.88/x
  3. Step 3: Cross multiply
    648.84x = 895.42 × 386.88
  4. Step 4: Simplify right side
    648.84x = 346,417.22
  5. Step 5: Solve for x
    x = 346,417.22/648.84
  6. Step 6: Final answer
    x = 533.90

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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.