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Finding the Fourth Proportional to 1,319.87, 1,821.27 and 854.12

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Solution

The fourth proportional to 1,319.87, 1,821.27 and 854.12 is: 1,178.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.87 : 1,821.27 = 854.12 : x
  2. Step 2: Convert to fraction form
    1,319.87/1,821.27 = 854.12/x
  3. Step 3: Cross multiply
    1,319.87x = 1,821.27 × 854.12
  4. Step 4: Simplify right side
    1,319.87x = 1,555,583.13
  5. Step 5: Solve for x
    x = 1,555,583.13/1,319.87
  6. Step 6: Final answer
    x = 1,178.59

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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.