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Finding the Fourth Proportional to 1,318.15, 1,977.27 and 798.13

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Solution

The fourth proportional to 1,318.15, 1,977.27 and 798.13 is: 1,197.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.15 : 1,977.27 = 798.13 : x
  2. Step 2: Convert to fraction form
    1,318.15/1,977.27 = 798.13/x
  3. Step 3: Cross multiply
    1,318.15x = 1,977.27 × 798.13
  4. Step 4: Simplify right side
    1,318.15x = 1,578,118.51
  5. Step 5: Solve for x
    x = 1,578,118.51/1,318.15
  6. Step 6: Final answer
    x = 1,197.22

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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.