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Finding the Fourth Proportional to 2,831.06, 4,247.18 and 856.80

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Solution

The fourth proportional to 2,831.06, 4,247.18 and 856.80 is: 1,285.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,831.06 : 4,247.18 = 856.80 : x
  2. Step 2: Convert to fraction form
    2,831.06/4,247.18 = 856.80/x
  3. Step 3: Cross multiply
    2,831.06x = 4,247.18 × 856.80
  4. Step 4: Simplify right side
    2,831.06x = 3,638,999.52
  5. Step 5: Solve for x
    x = 3,638,999.52/2,831.06
  6. Step 6: Final answer
    x = 1,285.38

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1.5x scale

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.