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Finding the Fourth Proportional to 742.99, 1,025.43 and 428.19

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Solution

The fourth proportional to 742.99, 1,025.43 and 428.19 is: 590.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.99 : 1,025.43 = 428.19 : x
  2. Step 2: Convert to fraction form
    742.99/1,025.43 = 428.19/x
  3. Step 3: Cross multiply
    742.99x = 1,025.43 × 428.19
  4. Step 4: Simplify right side
    742.99x = 439,077.80
  5. Step 5: Solve for x
    x = 439,077.80/742.99
  6. Step 6: Final answer
    x = 590.96

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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.