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Finding the Fourth Proportional to 747.57, 1,120.75 and 285.26

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Solution

The fourth proportional to 747.57, 1,120.75 and 285.26 is: 427.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.57 : 1,120.75 = 285.26 : x
  2. Step 2: Convert to fraction form
    747.57/1,120.75 = 285.26/x
  3. Step 3: Cross multiply
    747.57x = 1,120.75 × 285.26
  4. Step 4: Simplify right side
    747.57x = 319,707.23
  5. Step 5: Solve for x
    x = 319,707.23/747.57
  6. Step 6: Final answer
    x = 427.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.