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Finding the Fourth Proportional to 898.71, 1,240.23 and 505.83

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Solution

The fourth proportional to 898.71, 1,240.23 and 505.83 is: 698.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.71 : 1,240.23 = 505.83 : x
  2. Step 2: Convert to fraction form
    898.71/1,240.23 = 505.83/x
  3. Step 3: Cross multiply
    898.71x = 1,240.23 × 505.83
  4. Step 4: Simplify right side
    898.71x = 627,345.54
  5. Step 5: Solve for x
    x = 627,345.54/898.71
  6. Step 6: Final answer
    x = 698.05

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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.