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Finding the Fourth Proportional to 1,319.36, 1,978.70 and 497.39

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Solution

The fourth proportional to 1,319.36, 1,978.70 and 497.39 is: 745.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.36 : 1,978.70 = 497.39 : x
  2. Step 2: Convert to fraction form
    1,319.36/1,978.70 = 497.39/x
  3. Step 3: Cross multiply
    1,319.36x = 1,978.70 × 497.39
  4. Step 4: Simplify right side
    1,319.36x = 984,173.21
  5. Step 5: Solve for x
    x = 984,173.21/1,319.36
  6. Step 6: Final answer
    x = 745.95

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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.