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Finding the Fourth Proportional to 898.07, 1,238.67 and 618.39

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Solution

The fourth proportional to 898.07, 1,238.67 and 618.39 is: 852.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.07 : 1,238.67 = 618.39 : x
  2. Step 2: Convert to fraction form
    898.07/1,238.67 = 618.39/x
  3. Step 3: Cross multiply
    898.07x = 1,238.67 × 618.39
  4. Step 4: Simplify right side
    898.07x = 765,987.62
  5. Step 5: Solve for x
    x = 765,987.62/898.07
  6. Step 6: Final answer
    x = 852.93

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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.