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Finding the Fourth Proportional to 1,141.45, 1,574.51 and 721.46

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Solution

The fourth proportional to 1,141.45, 1,574.51 and 721.46 is: 995.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.45 : 1,574.51 = 721.46 : x
  2. Step 2: Convert to fraction form
    1,141.45/1,574.51 = 721.46/x
  3. Step 3: Cross multiply
    1,141.45x = 1,574.51 × 721.46
  4. Step 4: Simplify right side
    1,141.45x = 1,135,946.31
  5. Step 5: Solve for x
    x = 1,135,946.31/1,141.45
  6. Step 6: Final answer
    x = 995.18

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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.