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Finding the Fourth Proportional to 1,292.32, 1,783.42 and 702.87

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Solution

The fourth proportional to 1,292.32, 1,783.42 and 702.87 is: 969.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.32 : 1,783.42 = 702.87 : x
  2. Step 2: Convert to fraction form
    1,292.32/1,783.42 = 702.87/x
  3. Step 3: Cross multiply
    1,292.32x = 1,783.42 × 702.87
  4. Step 4: Simplify right side
    1,292.32x = 1,253,512.42
  5. Step 5: Solve for x
    x = 1,253,512.42/1,292.32
  6. Step 6: Final answer
    x = 969.97

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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.