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Finding the Fourth Proportional to 1,318.61, 1,978.38 and 588.12

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Solution

The fourth proportional to 1,318.61, 1,978.38 and 588.12 is: 882.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.61 : 1,978.38 = 588.12 : x
  2. Step 2: Convert to fraction form
    1,318.61/1,978.38 = 588.12/x
  3. Step 3: Cross multiply
    1,318.61x = 1,978.38 × 588.12
  4. Step 4: Simplify right side
    1,318.61x = 1,163,524.85
  5. Step 5: Solve for x
    x = 1,163,524.85/1,318.61
  6. Step 6: Final answer
    x = 882.39

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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.