Home / 1,221.51-1,831.46-399.50

Finding the Fourth Proportional to 1,221.51, 1,831.46 and 399.50

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Solution

The fourth proportional to 1,221.51, 1,831.46 and 399.50 is: 598.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.51 : 1,831.46 = 399.50 : x
  2. Step 2: Convert to fraction form
    1,221.51/1,831.46 = 399.50/x
  3. Step 3: Cross multiply
    1,221.51x = 1,831.46 × 399.50
  4. Step 4: Simplify right side
    1,221.51x = 731,657.12
  5. Step 5: Solve for x
    x = 731,657.12/1,221.51
  6. Step 6: Final answer
    x = 598.98

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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.