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Finding the Fourth Proportional to 1,128.87, 1,689.75 and 716.58

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Solution

The fourth proportional to 1,128.87, 1,689.75 and 716.58 is: 1,072.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.87 : 1,689.75 = 716.58 : x
  2. Step 2: Convert to fraction form
    1,128.87/1,689.75 = 716.58/x
  3. Step 3: Cross multiply
    1,128.87x = 1,689.75 × 716.58
  4. Step 4: Simplify right side
    1,128.87x = 1,210,841.06
  5. Step 5: Solve for x
    x = 1,210,841.06/1,128.87
  6. Step 6: Final answer
    x = 1,072.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.