Home / 1,929.90-2,660.60-1,221.38

Finding the Fourth Proportional to 1,929.90, 2,660.60 and 1,221.38

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Solution

The fourth proportional to 1,929.90, 2,660.60 and 1,221.38 is: 1,683.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,929.90 : 2,660.60 = 1,221.38 : x
  2. Step 2: Convert to fraction form
    1,929.90/2,660.60 = 1,221.38/x
  3. Step 3: Cross multiply
    1,929.90x = 2,660.60 × 1,221.38
  4. Step 4: Simplify right side
    1,929.90x = 3,249,603.63
  5. Step 5: Solve for x
    x = 3,249,603.63/1,929.90
  6. Step 6: Final answer
    x = 1,683.82

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1.5x scale

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.