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Finding the Fourth Proportional to 1,319.37, 1,978.77 and 497.62

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Solution

The fourth proportional to 1,319.37, 1,978.77 and 497.62 is: 746.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.37 : 1,978.77 = 497.62 : x
  2. Step 2: Convert to fraction form
    1,319.37/1,978.77 = 497.62/x
  3. Step 3: Cross multiply
    1,319.37x = 1,978.77 × 497.62
  4. Step 4: Simplify right side
    1,319.37x = 984,675.53
  5. Step 5: Solve for x
    x = 984,675.53/1,319.37
  6. Step 6: Final answer
    x = 746.33

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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.