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Finding the Fourth Proportional to 551.76, 761.52 and 420.52

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Solution

The fourth proportional to 551.76, 761.52 and 420.52 is: 580.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.76 : 761.52 = 420.52 : x
  2. Step 2: Convert to fraction form
    551.76/761.52 = 420.52/x
  3. Step 3: Cross multiply
    551.76x = 761.52 × 420.52
  4. Step 4: Simplify right side
    551.76x = 320,234.39
  5. Step 5: Solve for x
    x = 320,234.39/551.76
  6. Step 6: Final answer
    x = 580.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.