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Finding the Fourth Proportional to 648.72, 895.08 and 386.68

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Solution

The fourth proportional to 648.72, 895.08 and 386.68 is: 533.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.72 : 895.08 = 386.68 : x
  2. Step 2: Convert to fraction form
    648.72/895.08 = 386.68/x
  3. Step 3: Cross multiply
    648.72x = 895.08 × 386.68
  4. Step 4: Simplify right side
    648.72x = 346,109.53
  5. Step 5: Solve for x
    x = 346,109.53/648.72
  6. Step 6: Final answer
    x = 533.53

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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.