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Finding the Fourth Proportional to 1,390.52, 2,085.78 and 350.52

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Solution

The fourth proportional to 1,390.52, 2,085.78 and 350.52 is: 525.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.52 : 2,085.78 = 350.52 : x
  2. Step 2: Convert to fraction form
    1,390.52/2,085.78 = 350.52/x
  3. Step 3: Cross multiply
    1,390.52x = 2,085.78 × 350.52
  4. Step 4: Simplify right side
    1,390.52x = 731,107.61
  5. Step 5: Solve for x
    x = 731,107.61/1,390.52
  6. Step 6: Final answer
    x = 525.78

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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.