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Finding the Fourth Proportional to 551.34, 827.55 and 430.92

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Solution

The fourth proportional to 551.34, 827.55 and 430.92 is: 646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.34 : 827.55 = 430.92 : x
  2. Step 2: Convert to fraction form
    551.34/827.55 = 430.92/x
  3. Step 3: Cross multiply
    551.34x = 827.55 × 430.92
  4. Step 4: Simplify right side
    551.34x = 356,607.85
  5. Step 5: Solve for x
    x = 356,607.85/551.34
  6. Step 6: Final answer
    x = 646.80

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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.