Home / 1,312.32-1,983.34-1,289.64

Finding the Fourth Proportional to 1,312.32, 1,983.34 and 1,289.64

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Solution

The fourth proportional to 1,312.32, 1,983.34 and 1,289.64 is: 1,949.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.32 : 1,983.34 = 1,289.64 : x
  2. Step 2: Convert to fraction form
    1,312.32/1,983.34 = 1,289.64/x
  3. Step 3: Cross multiply
    1,312.32x = 1,983.34 × 1,289.64
  4. Step 4: Simplify right side
    1,312.32x = 2,557,794.60
  5. Step 5: Solve for x
    x = 2,557,794.60/1,312.32
  6. Step 6: Final answer
    x = 1,949.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.