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Finding the Fourth Proportional to 648.91, 895.86 and 497.21

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Solution

The fourth proportional to 648.91, 895.86 and 497.21 is: 686.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.91 : 895.86 = 497.21 : x
  2. Step 2: Convert to fraction form
    648.91/895.86 = 497.21/x
  3. Step 3: Cross multiply
    648.91x = 895.86 × 497.21
  4. Step 4: Simplify right side
    648.91x = 445,426.07
  5. Step 5: Solve for x
    x = 445,426.07/648.91
  6. Step 6: Final answer
    x = 686.42

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Double scale
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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.