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Finding the Fourth Proportional to 920.72, 1,381.08 and 488.40

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Solution

The fourth proportional to 920.72, 1,381.08 and 488.40 is: 732.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.72 : 1,381.08 = 488.40 : x
  2. Step 2: Convert to fraction form
    920.72/1,381.08 = 488.40/x
  3. Step 3: Cross multiply
    920.72x = 1,381.08 × 488.40
  4. Step 4: Simplify right side
    920.72x = 674,519.47
  5. Step 5: Solve for x
    x = 674,519.47/920.72
  6. Step 6: Final answer
    x = 732.60

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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.