Home / 1,929.72-2,660.36-1,221.20

Finding the Fourth Proportional to 1,929.72, 2,660.36 and 1,221.20

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Solution

The fourth proportional to 1,929.72, 2,660.36 and 1,221.20 is: 1,683.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,929.72 : 2,660.36 = 1,221.20 : x
  2. Step 2: Convert to fraction form
    1,929.72/2,660.36 = 1,221.20/x
  3. Step 3: Cross multiply
    1,929.72x = 2,660.36 × 1,221.20
  4. Step 4: Simplify right side
    1,929.72x = 3,248,831.63
  5. Step 5: Solve for x
    x = 3,248,831.63/1,929.72
  6. Step 6: Final answer
    x = 1,683.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.