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Finding the Fourth Proportional to 1,319.76, 1,978.12 and 497.51

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Solution

The fourth proportional to 1,319.76, 1,978.12 and 497.51 is: 745.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.76 : 1,978.12 = 497.51 : x
  2. Step 2: Convert to fraction form
    1,319.76/1,978.12 = 497.51/x
  3. Step 3: Cross multiply
    1,319.76x = 1,978.12 × 497.51
  4. Step 4: Simplify right side
    1,319.76x = 984,134.48
  5. Step 5: Solve for x
    x = 984,134.48/1,319.76
  6. Step 6: Final answer
    x = 745.69

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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.