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Finding the Fourth Proportional to 720.92, 1,080.90 and 623.42

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Solution

The fourth proportional to 720.92, 1,080.90 and 623.42 is: 934.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.92 : 1,080.90 = 623.42 : x
  2. Step 2: Convert to fraction form
    720.92/1,080.90 = 623.42/x
  3. Step 3: Cross multiply
    720.92x = 1,080.90 × 623.42
  4. Step 4: Simplify right side
    720.92x = 673,854.68
  5. Step 5: Solve for x
    x = 673,854.68/720.92
  6. Step 6: Final answer
    x = 934.71

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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.