Home / 1,321.10-1,821.75-1,135.20

Finding the Fourth Proportional to 1,321.10, 1,821.75 and 1,135.20

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Solution

The fourth proportional to 1,321.10, 1,821.75 and 1,135.20 is: 1,565.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.10 : 1,821.75 = 1,135.20 : x
  2. Step 2: Convert to fraction form
    1,321.10/1,821.75 = 1,135.20/x
  3. Step 3: Cross multiply
    1,321.10x = 1,821.75 × 1,135.20
  4. Step 4: Simplify right side
    1,321.10x = 2,068,050.60
  5. Step 5: Solve for x
    x = 2,068,050.60/1,321.10
  6. Step 6: Final answer
    x = 1,565.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.