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Finding the Fourth Proportional to 1,605.78, 2,409.35 and 618.91

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Solution

The fourth proportional to 1,605.78, 2,409.35 and 618.91 is: 928.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.78 : 2,409.35 = 618.91 : x
  2. Step 2: Convert to fraction form
    1,605.78/2,409.35 = 618.91/x
  3. Step 3: Cross multiply
    1,605.78x = 2,409.35 × 618.91
  4. Step 4: Simplify right side
    1,605.78x = 1,491,161.69
  5. Step 5: Solve for x
    x = 1,491,161.69/1,605.78
  6. Step 6: Final answer
    x = 928.62

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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.