Home / 2,189.40-3,285.32-1,312.18

Finding the Fourth Proportional to 2,189.40, 3,285.32 and 1,312.18

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Solution

The fourth proportional to 2,189.40, 3,285.32 and 1,312.18 is: 1,969.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.40 : 3,285.32 = 1,312.18 : x
  2. Step 2: Convert to fraction form
    2,189.40/3,285.32 = 1,312.18/x
  3. Step 3: Cross multiply
    2,189.40x = 3,285.32 × 1,312.18
  4. Step 4: Simplify right side
    2,189.40x = 4,310,931.20
  5. Step 5: Solve for x
    x = 4,310,931.20/2,189.40
  6. Step 6: Final answer
    x = 1,969.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.