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Finding the Fourth Proportional to 1,321.39, 1,981.35 and 541.18

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Solution

The fourth proportional to 1,321.39, 1,981.35 and 541.18 is: 811.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.39 : 1,981.35 = 541.18 : x
  2. Step 2: Convert to fraction form
    1,321.39/1,981.35 = 541.18/x
  3. Step 3: Cross multiply
    1,321.39x = 1,981.35 × 541.18
  4. Step 4: Simplify right side
    1,321.39x = 1,072,266.99
  5. Step 5: Solve for x
    x = 1,072,266.99/1,321.39
  6. Step 6: Final answer
    x = 811.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.