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Finding the Fourth Proportional to 1,887.21, 2,831.22 and 571.07

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Solution

The fourth proportional to 1,887.21, 2,831.22 and 571.07 is: 856.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.21 : 2,831.22 = 571.07 : x
  2. Step 2: Convert to fraction form
    1,887.21/2,831.22 = 571.07/x
  3. Step 3: Cross multiply
    1,887.21x = 2,831.22 × 571.07
  4. Step 4: Simplify right side
    1,887.21x = 1,616,810.65
  5. Step 5: Solve for x
    x = 1,616,810.65/1,887.21
  6. Step 6: Final answer
    x = 856.72

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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.