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Finding the Fourth Proportional to 898.80, 1,240.41 and 505.85

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Solution

The fourth proportional to 898.80, 1,240.41 and 505.85 is: 698.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.80 : 1,240.41 = 505.85 : x
  2. Step 2: Convert to fraction form
    898.80/1,240.41 = 505.85/x
  3. Step 3: Cross multiply
    898.80x = 1,240.41 × 505.85
  4. Step 4: Simplify right side
    898.80x = 627,457.09
  5. Step 5: Solve for x
    x = 627,457.09/898.80
  6. Step 6: Final answer
    x = 698.11

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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.