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Finding the Fourth Proportional to 898.78, 1,240.38 and 505.94

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Solution

The fourth proportional to 898.78, 1,240.38 and 505.94 is: 698.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.78 : 1,240.38 = 505.94 : x
  2. Step 2: Convert to fraction form
    898.78/1,240.38 = 505.94/x
  3. Step 3: Cross multiply
    898.78x = 1,240.38 × 505.94
  4. Step 4: Simplify right side
    898.78x = 627,557.86
  5. Step 5: Solve for x
    x = 627,557.86/898.78
  6. Step 6: Final answer
    x = 698.23

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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.