Home / 1,220.24-1,831.50-643.52

Finding the Fourth Proportional to 1,220.24, 1,831.50 and 643.52

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Solution

The fourth proportional to 1,220.24, 1,831.50 and 643.52 is: 965.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.24 : 1,831.50 = 643.52 : x
  2. Step 2: Convert to fraction form
    1,220.24/1,831.50 = 643.52/x
  3. Step 3: Cross multiply
    1,220.24x = 1,831.50 × 643.52
  4. Step 4: Simplify right side
    1,220.24x = 1,178,606.88
  5. Step 5: Solve for x
    x = 1,178,606.88/1,220.24
  6. Step 6: Final answer
    x = 965.88

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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.