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Finding the Fourth Proportional to 1,039.72, 1,559.21 and 346.24

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Solution

The fourth proportional to 1,039.72, 1,559.21 and 346.24 is: 519.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.72 : 1,559.21 = 346.24 : x
  2. Step 2: Convert to fraction form
    1,039.72/1,559.21 = 346.24/x
  3. Step 3: Cross multiply
    1,039.72x = 1,559.21 × 346.24
  4. Step 4: Simplify right side
    1,039.72x = 539,860.87
  5. Step 5: Solve for x
    x = 539,860.87/1,039.72
  6. Step 6: Final answer
    x = 519.24

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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.