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Finding the Fourth Proportional to 1,039.67, 1,558.48 and 423.74

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Solution

The fourth proportional to 1,039.67, 1,558.48 and 423.74 is: 635.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.67 : 1,558.48 = 423.74 : x
  2. Step 2: Convert to fraction form
    1,039.67/1,558.48 = 423.74/x
  3. Step 3: Cross multiply
    1,039.67x = 1,558.48 × 423.74
  4. Step 4: Simplify right side
    1,039.67x = 660,381.99
  5. Step 5: Solve for x
    x = 660,381.99/1,039.67
  6. Step 6: Final answer
    x = 635.18

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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.