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Finding the Fourth Proportional to 1,811.48, 2,717.28 and 657.23

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Solution

The fourth proportional to 1,811.48, 2,717.28 and 657.23 is: 985.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.48 : 2,717.28 = 657.23 : x
  2. Step 2: Convert to fraction form
    1,811.48/2,717.28 = 657.23/x
  3. Step 3: Cross multiply
    1,811.48x = 2,717.28 × 657.23
  4. Step 4: Simplify right side
    1,811.48x = 1,785,864.35
  5. Step 5: Solve for x
    x = 1,785,864.35/1,811.48
  6. Step 6: Final answer
    x = 985.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.