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Finding the Fourth Proportional to 1,039.60, 1,559.53 and 423.39

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Solution

The fourth proportional to 1,039.60, 1,559.53 and 423.39 is: 635.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.60 : 1,559.53 = 423.39 : x
  2. Step 2: Convert to fraction form
    1,039.60/1,559.53 = 423.39/x
  3. Step 3: Cross multiply
    1,039.60x = 1,559.53 × 423.39
  4. Step 4: Simplify right side
    1,039.60x = 660,289.41
  5. Step 5: Solve for x
    x = 660,289.41/1,039.60
  6. Step 6: Final answer
    x = 635.14

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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.