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Finding the Fourth Proportional to 551.18, 826.65 and 258.50

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Solution

The fourth proportional to 551.18, 826.65 and 258.50 is: 387.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.18 : 826.65 = 258.50 : x
  2. Step 2: Convert to fraction form
    551.18/826.65 = 258.50/x
  3. Step 3: Cross multiply
    551.18x = 826.65 × 258.50
  4. Step 4: Simplify right side
    551.18x = 213,689.03
  5. Step 5: Solve for x
    x = 213,689.03/551.18
  6. Step 6: Final answer
    x = 387.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.