Home / 2,989.12-4,120.20-2,358.64

Finding the Fourth Proportional to 2,989.12, 4,120.20 and 2,358.64

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Solution

The fourth proportional to 2,989.12, 4,120.20 and 2,358.64 is: 3,251.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,989.12 : 4,120.20 = 2,358.64 : x
  2. Step 2: Convert to fraction form
    2,989.12/4,120.20 = 2,358.64/x
  3. Step 3: Cross multiply
    2,989.12x = 4,120.20 × 2,358.64
  4. Step 4: Simplify right side
    2,989.12x = 9,718,068.53
  5. Step 5: Solve for x
    x = 9,718,068.53/2,989.12
  6. Step 6: Final answer
    x = 3,251.15

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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.