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Finding the Fourth Proportional to 1,143.39, 1,715.20 and 558.60

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Solution

The fourth proportional to 1,143.39, 1,715.20 and 558.60 is: 837.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.39 : 1,715.20 = 558.60 : x
  2. Step 2: Convert to fraction form
    1,143.39/1,715.20 = 558.60/x
  3. Step 3: Cross multiply
    1,143.39x = 1,715.20 × 558.60
  4. Step 4: Simplify right side
    1,143.39x = 958,104.46
  5. Step 5: Solve for x
    x = 958,104.46/1,143.39
  6. Step 6: Final answer
    x = 837.95

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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.