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Finding the Fourth Proportional to 1,295.47, 1,787.66 and 764.33

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Solution

The fourth proportional to 1,295.47, 1,787.66 and 764.33 is: 1,054.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,295.47 : 1,787.66 = 764.33 : x
  2. Step 2: Convert to fraction form
    1,295.47/1,787.66 = 764.33/x
  3. Step 3: Cross multiply
    1,295.47x = 1,787.66 × 764.33
  4. Step 4: Simplify right side
    1,295.47x = 1,366,349.41
  5. Step 5: Solve for x
    x = 1,366,349.41/1,295.47
  6. Step 6: Final answer
    x = 1,054.72

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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.