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Finding the Fourth Proportional to 1,298.23, 1,789.09 and 948.31

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Solution

The fourth proportional to 1,298.23, 1,789.09 and 948.31 is: 1,306.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.23 : 1,789.09 = 948.31 : x
  2. Step 2: Convert to fraction form
    1,298.23/1,789.09 = 948.31/x
  3. Step 3: Cross multiply
    1,298.23x = 1,789.09 × 948.31
  4. Step 4: Simplify right side
    1,298.23x = 1,696,611.94
  5. Step 5: Solve for x
    x = 1,696,611.94/1,298.23
  6. Step 6: Final answer
    x = 1,306.87

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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.