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Finding the Fourth Proportional to 742.25, 1,024.50 and 427.55

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Solution

The fourth proportional to 742.25, 1,024.50 and 427.55 is: 590.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.25 : 1,024.50 = 427.55 : x
  2. Step 2: Convert to fraction form
    742.25/1,024.50 = 427.55/x
  3. Step 3: Cross multiply
    742.25x = 1,024.50 × 427.55
  4. Step 4: Simplify right side
    742.25x = 438,024.98
  5. Step 5: Solve for x
    x = 438,024.98/742.25
  6. Step 6: Final answer
    x = 590.13

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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.