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Finding the Fourth Proportional to 881.70, 1,320.72 and 515.37

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Solution

The fourth proportional to 881.70, 1,320.72 and 515.37 is: 771.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.70 : 1,320.72 = 515.37 : x
  2. Step 2: Convert to fraction form
    881.70/1,320.72 = 515.37/x
  3. Step 3: Cross multiply
    881.70x = 1,320.72 × 515.37
  4. Step 4: Simplify right side
    881.70x = 680,659.47
  5. Step 5: Solve for x
    x = 680,659.47/881.70
  6. Step 6: Final answer
    x = 771.99

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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.