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Finding the Fourth Proportional to 881.13, 1,319.94 and 515.13

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Solution

The fourth proportional to 881.13, 1,319.94 and 515.13 is: 771.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.13 : 1,319.94 = 515.13 : x
  2. Step 2: Convert to fraction form
    881.13/1,319.94 = 515.13/x
  3. Step 3: Cross multiply
    881.13x = 1,319.94 × 515.13
  4. Step 4: Simplify right side
    881.13x = 679,940.69
  5. Step 5: Solve for x
    x = 679,940.69/881.13
  6. Step 6: Final answer
    x = 771.67

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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.