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Finding the Fourth Proportional to 1,143.78, 1,715.76 and 322.08

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Solution

The fourth proportional to 1,143.78, 1,715.76 and 322.08 is: 483.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.78 : 1,715.76 = 322.08 : x
  2. Step 2: Convert to fraction form
    1,143.78/1,715.76 = 322.08/x
  3. Step 3: Cross multiply
    1,143.78x = 1,715.76 × 322.08
  4. Step 4: Simplify right side
    1,143.78x = 552,611.98
  5. Step 5: Solve for x
    x = 552,611.98/1,143.78
  6. Step 6: Final answer
    x = 483.15

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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.