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Finding the Fourth Proportional to 817.70, 1,129.20 and 523.68

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Solution

The fourth proportional to 817.70, 1,129.20 and 523.68 is: 723.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.70 : 1,129.20 = 523.68 : x
  2. Step 2: Convert to fraction form
    817.70/1,129.20 = 523.68/x
  3. Step 3: Cross multiply
    817.70x = 1,129.20 × 523.68
  4. Step 4: Simplify right side
    817.70x = 591,339.46
  5. Step 5: Solve for x
    x = 591,339.46/817.70
  6. Step 6: Final answer
    x = 723.17

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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.