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Finding the Fourth Proportional to 809.67, 1,117.49 and 515.28

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Solution

The fourth proportional to 809.67, 1,117.49 and 515.28 is: 711.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.67 : 1,117.49 = 515.28 : x
  2. Step 2: Convert to fraction form
    809.67/1,117.49 = 515.28/x
  3. Step 3: Cross multiply
    809.67x = 1,117.49 × 515.28
  4. Step 4: Simplify right side
    809.67x = 575,820.25
  5. Step 5: Solve for x
    x = 575,820.25/809.67
  6. Step 6: Final answer
    x = 711.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.