Home / 1,320.80-1,818.68-1,154.05

Finding the Fourth Proportional to 1,320.80, 1,818.68 and 1,154.05

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Solution

The fourth proportional to 1,320.80, 1,818.68 and 1,154.05 is: 1,589.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.80 : 1,818.68 = 1,154.05 : x
  2. Step 2: Convert to fraction form
    1,320.80/1,818.68 = 1,154.05/x
  3. Step 3: Cross multiply
    1,320.80x = 1,818.68 × 1,154.05
  4. Step 4: Simplify right side
    1,320.80x = 2,098,837.34
  5. Step 5: Solve for x
    x = 2,098,837.34/1,320.80
  6. Step 6: Final answer
    x = 1,589.07

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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.