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Finding the Fourth Proportional to 1,171.21, 1,756.80 and 349.48

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Solution

The fourth proportional to 1,171.21, 1,756.80 and 349.48 is: 524.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.21 : 1,756.80 = 349.48 : x
  2. Step 2: Convert to fraction form
    1,171.21/1,756.80 = 349.48/x
  3. Step 3: Cross multiply
    1,171.21x = 1,756.80 × 349.48
  4. Step 4: Simplify right side
    1,171.21x = 613,966.46
  5. Step 5: Solve for x
    x = 613,966.46/1,171.21
  6. Step 6: Final answer
    x = 524.22

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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.