Home / 2,121.12-2,925.20-1,421.28

Finding the Fourth Proportional to 2,121.12, 2,925.20 and 1,421.28

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Solution

The fourth proportional to 2,121.12, 2,925.20 and 1,421.28 is: 1,960.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.12 : 2,925.20 = 1,421.28 : x
  2. Step 2: Convert to fraction form
    2,121.12/2,925.20 = 1,421.28/x
  3. Step 3: Cross multiply
    2,121.12x = 2,925.20 × 1,421.28
  4. Step 4: Simplify right side
    2,121.12x = 4,157,528.26
  5. Step 5: Solve for x
    x = 4,157,528.26/2,121.12
  6. Step 6: Final answer
    x = 1,960.06

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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.