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Finding the Fourth Proportional to 1,139.37, 1,572.44 and 767.12

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Solution

The fourth proportional to 1,139.37, 1,572.44 and 767.12 is: 1,058.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.37 : 1,572.44 = 767.12 : x
  2. Step 2: Convert to fraction form
    1,139.37/1,572.44 = 767.12/x
  3. Step 3: Cross multiply
    1,139.37x = 1,572.44 × 767.12
  4. Step 4: Simplify right side
    1,139.37x = 1,206,249.48
  5. Step 5: Solve for x
    x = 1,206,249.48/1,139.37
  6. Step 6: Final answer
    x = 1,058.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.