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Finding the Fourth Proportional to 809.79, 1,117.89 and 515.46

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Solution

The fourth proportional to 809.79, 1,117.89 and 515.46 is: 711.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.79 : 1,117.89 = 515.46 : x
  2. Step 2: Convert to fraction form
    809.79/1,117.89 = 515.46/x
  3. Step 3: Cross multiply
    809.79x = 1,117.89 × 515.46
  4. Step 4: Simplify right side
    809.79x = 576,225.00
  5. Step 5: Solve for x
    x = 576,225.00/809.79
  6. Step 6: Final answer
    x = 711.57

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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.