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Finding the Fourth Proportional to 671.78, 926.78 and 409.70

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Solution

The fourth proportional to 671.78, 926.78 and 409.70 is: 565.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.78 : 926.78 = 409.70 : x
  2. Step 2: Convert to fraction form
    671.78/926.78 = 409.70/x
  3. Step 3: Cross multiply
    671.78x = 926.78 × 409.70
  4. Step 4: Simplify right side
    671.78x = 379,701.77
  5. Step 5: Solve for x
    x = 379,701.77/671.78
  6. Step 6: Final answer
    x = 565.22

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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.