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Finding the Fourth Proportional to 1,261, 1,891.52 and 491.52

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Solution

The fourth proportional to 1,261, 1,891.52 and 491.52 is: 737.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261 : 1,891.52 = 491.52 : x
  2. Step 2: Convert to fraction form
    1,261/1,891.52 = 491.52/x
  3. Step 3: Cross multiply
    1,261x = 1,891.52 × 491.52
  4. Step 4: Simplify right side
    1,261x = 929,719.91
  5. Step 5: Solve for x
    x = 929,719.91/1,261
  6. Step 6: Final answer
    x = 737.29

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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.