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Finding the Fourth Proportional to 1,415.52, 2,123.82 and 491.18

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Solution

The fourth proportional to 1,415.52, 2,123.82 and 491.18 is: 736.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.52 : 2,123.82 = 491.18 : x
  2. Step 2: Convert to fraction form
    1,415.52/2,123.82 = 491.18/x
  3. Step 3: Cross multiply
    1,415.52x = 2,123.82 × 491.18
  4. Step 4: Simplify right side
    1,415.52x = 1,043,167.29
  5. Step 5: Solve for x
    x = 1,043,167.29/1,415.52
  6. Step 6: Final answer
    x = 736.95

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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.