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Finding the Fourth Proportional to 1,319.02, 1,819.11 and 821.14

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Solution

The fourth proportional to 1,319.02, 1,819.11 and 821.14 is: 1,132.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.02 : 1,819.11 = 821.14 : x
  2. Step 2: Convert to fraction form
    1,319.02/1,819.11 = 821.14/x
  3. Step 3: Cross multiply
    1,319.02x = 1,819.11 × 821.14
  4. Step 4: Simplify right side
    1,319.02x = 1,493,743.99
  5. Step 5: Solve for x
    x = 1,493,743.99/1,319.02
  6. Step 6: Final answer
    x = 1,132.47

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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.