Home / 1,220.72-1,831.08-399.08

Finding the Fourth Proportional to 1,220.72, 1,831.08 and 399.08

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Solution

The fourth proportional to 1,220.72, 1,831.08 and 399.08 is: 598.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.72 : 1,831.08 = 399.08 : x
  2. Step 2: Convert to fraction form
    1,220.72/1,831.08 = 399.08/x
  3. Step 3: Cross multiply
    1,220.72x = 1,831.08 × 399.08
  4. Step 4: Simplify right side
    1,220.72x = 730,747.41
  5. Step 5: Solve for x
    x = 730,747.41/1,220.72
  6. Step 6: Final answer
    x = 598.62

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Similar ratio
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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.