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Finding the Fourth Proportional to 1,318.45, 1,978.29 and 587.95

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Solution

The fourth proportional to 1,318.45, 1,978.29 and 587.95 is: 882.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.45 : 1,978.29 = 587.95 : x
  2. Step 2: Convert to fraction form
    1,318.45/1,978.29 = 587.95/x
  3. Step 3: Cross multiply
    1,318.45x = 1,978.29 × 587.95
  4. Step 4: Simplify right side
    1,318.45x = 1,163,135.61
  5. Step 5: Solve for x
    x = 1,163,135.61/1,318.45
  6. Step 6: Final answer
    x = 882.20

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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.