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Finding the Fourth Proportional to 1,887.14, 2,831.11 and 790.87

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Solution

The fourth proportional to 1,887.14, 2,831.11 and 790.87 is: 1,186.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,887.14 : 2,831.11 = 790.87 : x
  2. Step 2: Convert to fraction form
    1,887.14/2,831.11 = 790.87/x
  3. Step 3: Cross multiply
    1,887.14x = 2,831.11 × 790.87
  4. Step 4: Simplify right side
    1,887.14x = 2,239,030.91
  5. Step 5: Solve for x
    x = 2,239,030.91/1,887.14
  6. Step 6: Final answer
    x = 1,186.47

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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.