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Finding the Fourth Proportional to 1,147.58, 1,582.62 and 811.72

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Solution

The fourth proportional to 1,147.58, 1,582.62 and 811.72 is: 1,119.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.58 : 1,582.62 = 811.72 : x
  2. Step 2: Convert to fraction form
    1,147.58/1,582.62 = 811.72/x
  3. Step 3: Cross multiply
    1,147.58x = 1,582.62 × 811.72
  4. Step 4: Simplify right side
    1,147.58x = 1,284,644.31
  5. Step 5: Solve for x
    x = 1,284,644.31/1,147.58
  6. Step 6: Final answer
    x = 1,119.44

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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.