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Finding the Fourth Proportional to 2,390.94, 3,587.33 and 831.11

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Solution

The fourth proportional to 2,390.94, 3,587.33 and 831.11 is: 1,246.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.94 : 3,587.33 = 831.11 : x
  2. Step 2: Convert to fraction form
    2,390.94/3,587.33 = 831.11/x
  3. Step 3: Cross multiply
    2,390.94x = 3,587.33 × 831.11
  4. Step 4: Simplify right side
    2,390.94x = 2,981,449.98
  5. Step 5: Solve for x
    x = 2,981,449.98/2,390.94
  6. Step 6: Final answer
    x = 1,246.98

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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.