Home / 1,520.38-2,098.12-821.75

Finding the Fourth Proportional to 1,520.38, 2,098.12 and 821.75

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Solution

The fourth proportional to 1,520.38, 2,098.12 and 821.75 is: 1,134.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.38 : 2,098.12 = 821.75 : x
  2. Step 2: Convert to fraction form
    1,520.38/2,098.12 = 821.75/x
  3. Step 3: Cross multiply
    1,520.38x = 2,098.12 × 821.75
  4. Step 4: Simplify right side
    1,520.38x = 1,724,130.11
  5. Step 5: Solve for x
    x = 1,724,130.11/1,520.38
  6. Step 6: Final answer
    x = 1,134.02

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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.