Home / 1,126.20-1,690.30-663.40

Finding the Fourth Proportional to 1,126.20, 1,690.30 and 663.40

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Solution

The fourth proportional to 1,126.20, 1,690.30 and 663.40 is: 995.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.20 : 1,690.30 = 663.40 : x
  2. Step 2: Convert to fraction form
    1,126.20/1,690.30 = 663.40/x
  3. Step 3: Cross multiply
    1,126.20x = 1,690.30 × 663.40
  4. Step 4: Simplify right side
    1,126.20x = 1,121,345.02
  5. Step 5: Solve for x
    x = 1,121,345.02/1,126.20
  6. Step 6: Final answer
    x = 995.69

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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.