Home / 3,421.28-4,721.64-1,929.20

Finding the Fourth Proportional to 3,421.28, 4,721.64 and 1,929.20

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Solution

The fourth proportional to 3,421.28, 4,721.64 and 1,929.20 is: 2,662.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.28 : 4,721.64 = 1,929.20 : x
  2. Step 2: Convert to fraction form
    3,421.28/4,721.64 = 1,929.20/x
  3. Step 3: Cross multiply
    3,421.28x = 4,721.64 × 1,929.20
  4. Step 4: Simplify right side
    3,421.28x = 9,108,987.89
  5. Step 5: Solve for x
    x = 9,108,987.89/3,421.28
  6. Step 6: Final answer
    x = 2,662.45

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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.