Home / 1,386.20-2,079.30-1,142.12

Finding the Fourth Proportional to 1,386.20, 2,079.30 and 1,142.12

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Solution

The fourth proportional to 1,386.20, 2,079.30 and 1,142.12 is: 1,713.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.20 : 2,079.30 = 1,142.12 : x
  2. Step 2: Convert to fraction form
    1,386.20/2,079.30 = 1,142.12/x
  3. Step 3: Cross multiply
    1,386.20x = 2,079.30 × 1,142.12
  4. Step 4: Simplify right side
    1,386.20x = 2,374,810.12
  5. Step 5: Solve for x
    x = 2,374,810.12/1,386.20
  6. Step 6: Final answer
    x = 1,713.18

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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.