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Finding the Fourth Proportional to 863.24, 1,293.60 and 430.70

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Solution

The fourth proportional to 863.24, 1,293.60 and 430.70 is: 645.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.24 : 1,293.60 = 430.70 : x
  2. Step 2: Convert to fraction form
    863.24/1,293.60 = 430.70/x
  3. Step 3: Cross multiply
    863.24x = 1,293.60 × 430.70
  4. Step 4: Simplify right side
    863.24x = 557,153.52
  5. Step 5: Solve for x
    x = 557,153.52/863.24
  6. Step 6: Final answer
    x = 645.42

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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.