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Finding the Fourth Proportional to 1,242.31, 1,714.39 and 776.56

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Solution

The fourth proportional to 1,242.31, 1,714.39 and 776.56 is: 1,071.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.31 : 1,714.39 = 776.56 : x
  2. Step 2: Convert to fraction form
    1,242.31/1,714.39 = 776.56/x
  3. Step 3: Cross multiply
    1,242.31x = 1,714.39 × 776.56
  4. Step 4: Simplify right side
    1,242.31x = 1,331,326.70
  5. Step 5: Solve for x
    x = 1,331,326.70/1,242.31
  6. Step 6: Final answer
    x = 1,071.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.