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Finding the Fourth Proportional to 1,326.31, 1,830.16 and 766.64

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Solution

The fourth proportional to 1,326.31, 1,830.16 and 766.64 is: 1,057.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.31 : 1,830.16 = 766.64 : x
  2. Step 2: Convert to fraction form
    1,326.31/1,830.16 = 766.64/x
  3. Step 3: Cross multiply
    1,326.31x = 1,830.16 × 766.64
  4. Step 4: Simplify right side
    1,326.31x = 1,403,073.86
  5. Step 5: Solve for x
    x = 1,403,073.86/1,326.31
  6. Step 6: Final answer
    x = 1,057.88

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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.