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Finding the Fourth Proportional to 1,887.68, 2,831.56 and 655.13

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Solution

The fourth proportional to 1,887.68, 2,831.56 and 655.13 is: 982.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.68 : 2,831.56 = 655.13 : x
  2. Step 2: Convert to fraction form
    1,887.68/2,831.56 = 655.13/x
  3. Step 3: Cross multiply
    1,887.68x = 2,831.56 × 655.13
  4. Step 4: Simplify right side
    1,887.68x = 1,855,039.90
  5. Step 5: Solve for x
    x = 1,855,039.90/1,887.68
  6. Step 6: Final answer
    x = 982.71

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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.