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Finding the Fourth Proportional to 920.98, 1,381.47 and 648.29

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Solution

The fourth proportional to 920.98, 1,381.47 and 648.29 is: 972.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.98 : 1,381.47 = 648.29 : x
  2. Step 2: Convert to fraction form
    920.98/1,381.47 = 648.29/x
  3. Step 3: Cross multiply
    920.98x = 1,381.47 × 648.29
  4. Step 4: Simplify right side
    920.98x = 895,593.19
  5. Step 5: Solve for x
    x = 895,593.19/920.98
  6. Step 6: Final answer
    x = 972.44

Related Problems

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.