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Finding the Fourth Proportional to 742.55, 1,024.74 and 427.82

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Solution

The fourth proportional to 742.55, 1,024.74 and 427.82 is: 590.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.55 : 1,024.74 = 427.82 : x
  2. Step 2: Convert to fraction form
    742.55/1,024.74 = 427.82/x
  3. Step 3: Cross multiply
    742.55x = 1,024.74 × 427.82
  4. Step 4: Simplify right side
    742.55x = 438,399.14
  5. Step 5: Solve for x
    x = 438,399.14/742.55
  6. Step 6: Final answer
    x = 590.40

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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.