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Finding the Fourth Proportional to 1,393.57, 2,089.62 and 515.85

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Solution

The fourth proportional to 1,393.57, 2,089.62 and 515.85 is: 773.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.57 : 2,089.62 = 515.85 : x
  2. Step 2: Convert to fraction form
    1,393.57/2,089.62 = 515.85/x
  3. Step 3: Cross multiply
    1,393.57x = 2,089.62 × 515.85
  4. Step 4: Simplify right side
    1,393.57x = 1,077,930.48
  5. Step 5: Solve for x
    x = 1,077,930.48/1,393.57
  6. Step 6: Final answer
    x = 773.50

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1.5x scale

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.