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Finding the Fourth Proportional to 1,039.20, 1,559.04 and 345.92

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Solution

The fourth proportional to 1,039.20, 1,559.04 and 345.92 is: 518.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.20 : 1,559.04 = 345.92 : x
  2. Step 2: Convert to fraction form
    1,039.20/1,559.04 = 345.92/x
  3. Step 3: Cross multiply
    1,039.20x = 1,559.04 × 345.92
  4. Step 4: Simplify right side
    1,039.20x = 539,303.12
  5. Step 5: Solve for x
    x = 539,303.12/1,039.20
  6. Step 6: Final answer
    x = 518.96

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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.