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Finding the Fourth Proportional to 1,127.68, 1,556.72 and 708.68

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Solution

The fourth proportional to 1,127.68, 1,556.72 and 708.68 is: 978.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.68 : 1,556.72 = 708.68 : x
  2. Step 2: Convert to fraction form
    1,127.68/1,556.72 = 708.68/x
  3. Step 3: Cross multiply
    1,127.68x = 1,556.72 × 708.68
  4. Step 4: Simplify right side
    1,127.68x = 1,103,216.33
  5. Step 5: Solve for x
    x = 1,103,216.33/1,127.68
  6. Step 6: Final answer
    x = 978.31

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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.