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Finding the Fourth Proportional to 920.57, 1,380.72 and 304.30

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Solution

The fourth proportional to 920.57, 1,380.72 and 304.30 is: 456.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.57 : 1,380.72 = 304.30 : x
  2. Step 2: Convert to fraction form
    920.57/1,380.72 = 304.30/x
  3. Step 3: Cross multiply
    920.57x = 1,380.72 × 304.30
  4. Step 4: Simplify right side
    920.57x = 420,151.57
  5. Step 5: Solve for x
    x = 420,151.57/920.57
  6. Step 6: Final answer
    x = 456.40

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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.