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Finding the Fourth Proportional to 1,128.50, 1,556.88 and 708.68

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Solution

The fourth proportional to 1,128.50, 1,556.88 and 708.68 is: 977.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.50 : 1,556.88 = 708.68 : x
  2. Step 2: Convert to fraction form
    1,128.50/1,556.88 = 708.68/x
  3. Step 3: Cross multiply
    1,128.50x = 1,556.88 × 708.68
  4. Step 4: Simplify right side
    1,128.50x = 1,103,329.72
  5. Step 5: Solve for x
    x = 1,103,329.72/1,128.50
  6. Step 6: Final answer
    x = 977.70

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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.