Home / 2,385.32-3,291.81-1,390.64

Finding the Fourth Proportional to 2,385.32, 3,291.81 and 1,390.64

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Solution

The fourth proportional to 2,385.32, 3,291.81 and 1,390.64 is: 1,919.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,385.32 : 3,291.81 = 1,390.64 : x
  2. Step 2: Convert to fraction form
    2,385.32/3,291.81 = 1,390.64/x
  3. Step 3: Cross multiply
    2,385.32x = 3,291.81 × 1,390.64
  4. Step 4: Simplify right side
    2,385.32x = 4,577,722.66
  5. Step 5: Solve for x
    x = 4,577,722.66/2,385.32
  6. Step 6: Final answer
    x = 1,919.12

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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.