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Finding the Fourth Proportional to 916.59, 1,265.50 and 818.18

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Solution

The fourth proportional to 916.59, 1,265.50 and 818.18 is: 1,129.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.59 : 1,265.50 = 818.18 : x
  2. Step 2: Convert to fraction form
    916.59/1,265.50 = 818.18/x
  3. Step 3: Cross multiply
    916.59x = 1,265.50 × 818.18
  4. Step 4: Simplify right side
    916.59x = 1,035,406.79
  5. Step 5: Solve for x
    x = 1,035,406.79/916.59
  6. Step 6: Final answer
    x = 1,129.63

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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.