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Finding the Fourth Proportional to 551.13, 824.69 and 521.45

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Solution

The fourth proportional to 551.13, 824.69 and 521.45 is: 780.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.13 : 824.69 = 521.45 : x
  2. Step 2: Convert to fraction form
    551.13/824.69 = 521.45/x
  3. Step 3: Cross multiply
    551.13x = 824.69 × 521.45
  4. Step 4: Simplify right side
    551.13x = 430,027.87
  5. Step 5: Solve for x
    x = 430,027.87/551.13
  6. Step 6: Final answer
    x = 780.27

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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.