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Finding the Fourth Proportional to 742.23, 1,024.18 and 427.55

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Solution

The fourth proportional to 742.23, 1,024.18 and 427.55 is: 589.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.23 : 1,024.18 = 427.55 : x
  2. Step 2: Convert to fraction form
    742.23/1,024.18 = 427.55/x
  3. Step 3: Cross multiply
    742.23x = 1,024.18 × 427.55
  4. Step 4: Simplify right side
    742.23x = 437,881.97
  5. Step 5: Solve for x
    x = 437,881.97/742.23
  6. Step 6: Final answer
    x = 589.95

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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.