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Finding the Fourth Proportional to 818.88, 1,129.26 and 499.76

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Solution

The fourth proportional to 818.88, 1,129.26 and 499.76 is: 689.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.88 : 1,129.26 = 499.76 : x
  2. Step 2: Convert to fraction form
    818.88/1,129.26 = 499.76/x
  3. Step 3: Cross multiply
    818.88x = 1,129.26 × 499.76
  4. Step 4: Simplify right side
    818.88x = 564,358.98
  5. Step 5: Solve for x
    x = 564,358.98/818.88
  6. Step 6: Final answer
    x = 689.18

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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.