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Finding the Fourth Proportional to 1,039.16, 1,558.32 and 423.18

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Solution

The fourth proportional to 1,039.16, 1,558.32 and 423.18 is: 634.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.16 : 1,558.32 = 423.18 : x
  2. Step 2: Convert to fraction form
    1,039.16/1,558.32 = 423.18/x
  3. Step 3: Cross multiply
    1,039.16x = 1,558.32 × 423.18
  4. Step 4: Simplify right side
    1,039.16x = 659,449.86
  5. Step 5: Solve for x
    x = 659,449.86/1,039.16
  6. Step 6: Final answer
    x = 634.60

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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.