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Finding the Fourth Proportional to 789.38, 1,089.20 and 457.74

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Solution

The fourth proportional to 789.38, 1,089.20 and 457.74 is: 631.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.38 : 1,089.20 = 457.74 : x
  2. Step 2: Convert to fraction form
    789.38/1,089.20 = 457.74/x
  3. Step 3: Cross multiply
    789.38x = 1,089.20 × 457.74
  4. Step 4: Simplify right side
    789.38x = 498,570.41
  5. Step 5: Solve for x
    x = 498,570.41/789.38
  6. Step 6: Final answer
    x = 631.60

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.