Home / 1,220.92-1,831.15-399.72

Finding the Fourth Proportional to 1,220.92, 1,831.15 and 399.72

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Solution

The fourth proportional to 1,220.92, 1,831.15 and 399.72 is: 599.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.92 : 1,831.15 = 399.72 : x
  2. Step 2: Convert to fraction form
    1,220.92/1,831.15 = 399.72/x
  3. Step 3: Cross multiply
    1,220.92x = 1,831.15 × 399.72
  4. Step 4: Simplify right side
    1,220.92x = 731,947.28
  5. Step 5: Solve for x
    x = 731,947.28/1,220.92
  6. Step 6: Final answer
    x = 599.50

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Double scale
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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.