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Finding the Fourth Proportional to 890.85, 1,334.28 and 515.15

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Solution

The fourth proportional to 890.85, 1,334.28 and 515.15 is: 771.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.85 : 1,334.28 = 515.15 : x
  2. Step 2: Convert to fraction form
    890.85/1,334.28 = 515.15/x
  3. Step 3: Cross multiply
    890.85x = 1,334.28 × 515.15
  4. Step 4: Simplify right side
    890.85x = 687,347.67
  5. Step 5: Solve for x
    x = 687,347.67/890.85
  6. Step 6: Final answer
    x = 771.56

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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.