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Finding the Fourth Proportional to 813.59, 1,123.68 and 551.15

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Solution

The fourth proportional to 813.59, 1,123.68 and 551.15 is: 761.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.59 : 1,123.68 = 551.15 : x
  2. Step 2: Convert to fraction form
    813.59/1,123.68 = 551.15/x
  3. Step 3: Cross multiply
    813.59x = 1,123.68 × 551.15
  4. Step 4: Simplify right side
    813.59x = 619,316.23
  5. Step 5: Solve for x
    x = 619,316.23/813.59
  6. Step 6: Final answer
    x = 761.21

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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.