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Finding the Fourth Proportional to 1,986.02, 2,979.30 and 831.50

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Solution

The fourth proportional to 1,986.02, 2,979.30 and 831.50 is: 1,247.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.02 : 2,979.30 = 831.50 : x
  2. Step 2: Convert to fraction form
    1,986.02/2,979.30 = 831.50/x
  3. Step 3: Cross multiply
    1,986.02x = 2,979.30 × 831.50
  4. Step 4: Simplify right side
    1,986.02x = 2,477,287.95
  5. Step 5: Solve for x
    x = 2,477,287.95/1,986.02
  6. Step 6: Final answer
    x = 1,247.36

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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.