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Finding the Fourth Proportional to 920.16, 1,382.40 and 487.08

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Solution

The fourth proportional to 920.16, 1,382.40 and 487.08 is: 731.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.16 : 1,382.40 = 487.08 : x
  2. Step 2: Convert to fraction form
    920.16/1,382.40 = 487.08/x
  3. Step 3: Cross multiply
    920.16x = 1,382.40 × 487.08
  4. Step 4: Simplify right side
    920.16x = 673,339.39
  5. Step 5: Solve for x
    x = 673,339.39/920.16
  6. Step 6: Final answer
    x = 731.76

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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.