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Finding the Fourth Proportional to 410.45, 618.50 and 391.91

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Solution

The fourth proportional to 410.45, 618.50 and 391.91 is: 590.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    410.45 : 618.50 = 391.91 : x
  2. Step 2: Convert to fraction form
    410.45/618.50 = 391.91/x
  3. Step 3: Cross multiply
    410.45x = 618.50 × 391.91
  4. Step 4: Simplify right side
    410.45x = 242,396.34
  5. Step 5: Solve for x
    x = 242,396.34/410.45
  6. Step 6: Final answer
    x = 590.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.