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Finding the Fourth Proportional to 898.61, 1,238.81 and 886.28

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Solution

The fourth proportional to 898.61, 1,238.81 and 886.28 is: 1,221.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.61 : 1,238.81 = 886.28 : x
  2. Step 2: Convert to fraction form
    898.61/1,238.81 = 886.28/x
  3. Step 3: Cross multiply
    898.61x = 1,238.81 × 886.28
  4. Step 4: Simplify right side
    898.61x = 1,097,921.90
  5. Step 5: Solve for x
    x = 1,097,921.90/898.61
  6. Step 6: Final answer
    x = 1,221.81

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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.