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Finding the Fourth Proportional to 993.63, 1,371.19 and 551.55

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Solution

The fourth proportional to 993.63, 1,371.19 and 551.55 is: 761.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.63 : 1,371.19 = 551.55 : x
  2. Step 2: Convert to fraction form
    993.63/1,371.19 = 551.55/x
  3. Step 3: Cross multiply
    993.63x = 1,371.19 × 551.55
  4. Step 4: Simplify right side
    993.63x = 756,279.84
  5. Step 5: Solve for x
    x = 756,279.84/993.63
  6. Step 6: Final answer
    x = 761.13

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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.