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Finding the Fourth Proportional to 1,887.28, 2,831.10 and 716.92

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Solution

The fourth proportional to 1,887.28, 2,831.10 and 716.92 is: 1,075.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.28 : 2,831.10 = 716.92 : x
  2. Step 2: Convert to fraction form
    1,887.28/2,831.10 = 716.92/x
  3. Step 3: Cross multiply
    1,887.28x = 2,831.10 × 716.92
  4. Step 4: Simplify right side
    1,887.28x = 2,029,672.21
  5. Step 5: Solve for x
    x = 2,029,672.21/1,887.28
  6. Step 6: Final answer
    x = 1,075.45

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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.