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Finding the Fourth Proportional to 1,129.24, 1,557.79 and 709.37

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Solution

The fourth proportional to 1,129.24, 1,557.79 and 709.37 is: 978.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.24 : 1,557.79 = 709.37 : x
  2. Step 2: Convert to fraction form
    1,129.24/1,557.79 = 709.37/x
  3. Step 3: Cross multiply
    1,129.24x = 1,557.79 × 709.37
  4. Step 4: Simplify right side
    1,129.24x = 1,105,049.49
  5. Step 5: Solve for x
    x = 1,105,049.49/1,129.24
  6. Step 6: Final answer
    x = 978.58

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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.