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Finding the Fourth Proportional to 1,143.56, 1,715.30 and 321.81

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Solution

The fourth proportional to 1,143.56, 1,715.30 and 321.81 is: 482.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.56 : 1,715.30 = 321.81 : x
  2. Step 2: Convert to fraction form
    1,143.56/1,715.30 = 321.81/x
  3. Step 3: Cross multiply
    1,143.56x = 1,715.30 × 321.81
  4. Step 4: Simplify right side
    1,143.56x = 551,995.67
  5. Step 5: Solve for x
    x = 551,995.67/1,143.56
  6. Step 6: Final answer
    x = 482.70

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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.