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Finding the Fourth Proportional to 742.65, 1,024.83 and 428.02

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Solution

The fourth proportional to 742.65, 1,024.83 and 428.02 is: 590.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.65 : 1,024.83 = 428.02 : x
  2. Step 2: Convert to fraction form
    742.65/1,024.83 = 428.02/x
  3. Step 3: Cross multiply
    742.65x = 1,024.83 × 428.02
  4. Step 4: Simplify right side
    742.65x = 438,647.74
  5. Step 5: Solve for x
    x = 438,647.74/742.65
  6. Step 6: Final answer
    x = 590.65

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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.