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Finding the Fourth Proportional to 1,128.32, 1,556.48 and 686.08

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Solution

The fourth proportional to 1,128.32, 1,556.48 and 686.08 is: 946.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.32 : 1,556.48 = 686.08 : x
  2. Step 2: Convert to fraction form
    1,128.32/1,556.48 = 686.08/x
  3. Step 3: Cross multiply
    1,128.32x = 1,556.48 × 686.08
  4. Step 4: Simplify right side
    1,128.32x = 1,067,869.80
  5. Step 5: Solve for x
    x = 1,067,869.80/1,128.32
  6. Step 6: Final answer
    x = 946.42

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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.