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Finding the Fourth Proportional to 1,126.58, 1,689.46 and 578.68

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Solution

The fourth proportional to 1,126.58, 1,689.46 and 578.68 is: 867.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.58 : 1,689.46 = 578.68 : x
  2. Step 2: Convert to fraction form
    1,126.58/1,689.46 = 578.68/x
  3. Step 3: Cross multiply
    1,126.58x = 1,689.46 × 578.68
  4. Step 4: Simplify right side
    1,126.58x = 977,651.04
  5. Step 5: Solve for x
    x = 977,651.04/1,126.58
  6. Step 6: Final answer
    x = 867.81

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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.