Home / 3,928.40-5,421.28-2,160.16

Finding the Fourth Proportional to 3,928.40, 5,421.28 and 2,160.16

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Solution

The fourth proportional to 3,928.40, 5,421.28 and 2,160.16 is: 2,981.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.40 : 5,421.28 = 2,160.16 : x
  2. Step 2: Convert to fraction form
    3,928.40/5,421.28 = 2,160.16/x
  3. Step 3: Cross multiply
    3,928.40x = 5,421.28 × 2,160.16
  4. Step 4: Simplify right side
    3,928.40x = 11,710,832.20
  5. Step 5: Solve for x
    x = 11,710,832.20/3,928.40
  6. Step 6: Final answer
    x = 2,981.07

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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.