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Finding the Fourth Proportional to 1,265.31, 1,890.18 and 897.21

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Solution

The fourth proportional to 1,265.31, 1,890.18 and 897.21 is: 1,340.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,265.31 : 1,890.18 = 897.21 : x
  2. Step 2: Convert to fraction form
    1,265.31/1,890.18 = 897.21/x
  3. Step 3: Cross multiply
    1,265.31x = 1,890.18 × 897.21
  4. Step 4: Simplify right side
    1,265.31x = 1,695,888.40
  5. Step 5: Solve for x
    x = 1,695,888.40/1,265.31
  6. Step 6: Final answer
    x = 1,340.29

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.