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Finding the Fourth Proportional to 551.61, 815.87 and 551.61

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Solution

The fourth proportional to 551.61, 815.87 and 551.61 is: 815.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.61 : 815.87 = 551.61 : x
  2. Step 2: Convert to fraction form
    551.61/815.87 = 551.61/x
  3. Step 3: Cross multiply
    551.61x = 815.87 × 551.61
  4. Step 4: Simplify right side
    551.61x = 450,043.43
  5. Step 5: Solve for x
    x = 450,043.43/551.61
  6. Step 6: Final answer
    x = 815.87

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.