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Finding the Fourth Proportional to 1,328.12, 1,831.54 and 879.28

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Solution

The fourth proportional to 1,328.12, 1,831.54 and 879.28 is: 1,212.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.12 : 1,831.54 = 879.28 : x
  2. Step 2: Convert to fraction form
    1,328.12/1,831.54 = 879.28/x
  3. Step 3: Cross multiply
    1,328.12x = 1,831.54 × 879.28
  4. Step 4: Simplify right side
    1,328.12x = 1,610,432.09
  5. Step 5: Solve for x
    x = 1,610,432.09/1,328.12
  6. Step 6: Final answer
    x = 1,212.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.