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Finding the Fourth Proportional to 1,291.71, 1,938.92 and 805.10

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Solution

The fourth proportional to 1,291.71, 1,938.92 and 805.10 is: 1,208.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.71 : 1,938.92 = 805.10 : x
  2. Step 2: Convert to fraction form
    1,291.71/1,938.92 = 805.10/x
  3. Step 3: Cross multiply
    1,291.71x = 1,938.92 × 805.10
  4. Step 4: Simplify right side
    1,291.71x = 1,561,024.49
  5. Step 5: Solve for x
    x = 1,561,024.49/1,291.71
  6. Step 6: Final answer
    x = 1,208.49

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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.