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Finding the Fourth Proportional to 1,261.83, 1,889.96 and 773.40

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Solution

The fourth proportional to 1,261.83, 1,889.96 and 773.40 is: 1,158.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.83 : 1,889.96 = 773.40 : x
  2. Step 2: Convert to fraction form
    1,261.83/1,889.96 = 773.40/x
  3. Step 3: Cross multiply
    1,261.83x = 1,889.96 × 773.40
  4. Step 4: Simplify right side
    1,261.83x = 1,461,691.20
  5. Step 5: Solve for x
    x = 1,461,691.20/1,261.83
  6. Step 6: Final answer
    x = 1,158.39

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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.