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Finding the Fourth Proportional to 551.28, 821.85 and 525.36

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Solution

The fourth proportional to 551.28, 821.85 and 525.36 is: 783.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.28 : 821.85 = 525.36 : x
  2. Step 2: Convert to fraction form
    551.28/821.85 = 525.36/x
  3. Step 3: Cross multiply
    551.28x = 821.85 × 525.36
  4. Step 4: Simplify right side
    551.28x = 431,767.12
  5. Step 5: Solve for x
    x = 431,767.12/551.28
  6. Step 6: Final answer
    x = 783.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.