Home / 1,118.50-1,680.30-790.18

Finding the Fourth Proportional to 1,118.50, 1,680.30 and 790.18

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Solution

The fourth proportional to 1,118.50, 1,680.30 and 790.18 is: 1,187.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.50 : 1,680.30 = 790.18 : x
  2. Step 2: Convert to fraction form
    1,118.50/1,680.30 = 790.18/x
  3. Step 3: Cross multiply
    1,118.50x = 1,680.30 × 790.18
  4. Step 4: Simplify right side
    1,118.50x = 1,327,735.25
  5. Step 5: Solve for x
    x = 1,327,735.25/1,118.50
  6. Step 6: Final answer
    x = 1,187.07

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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.