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Finding the Fourth Proportional to 1,293.56, 1,938.86 and 642.84

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Solution

The fourth proportional to 1,293.56, 1,938.86 and 642.84 is: 963.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.56 : 1,938.86 = 642.84 : x
  2. Step 2: Convert to fraction form
    1,293.56/1,938.86 = 642.84/x
  3. Step 3: Cross multiply
    1,293.56x = 1,938.86 × 642.84
  4. Step 4: Simplify right side
    1,293.56x = 1,246,376.76
  5. Step 5: Solve for x
    x = 1,246,376.76/1,293.56
  6. Step 6: Final answer
    x = 963.52

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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.