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Finding the Fourth Proportional to 981.84, 1,470.86 and 787.26

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Solution

The fourth proportional to 981.84, 1,470.86 and 787.26 is: 1,179.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.84 : 1,470.86 = 787.26 : x
  2. Step 2: Convert to fraction form
    981.84/1,470.86 = 787.26/x
  3. Step 3: Cross multiply
    981.84x = 1,470.86 × 787.26
  4. Step 4: Simplify right side
    981.84x = 1,157,949.24
  5. Step 5: Solve for x
    x = 1,157,949.24/981.84
  6. Step 6: Final answer
    x = 1,179.37

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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.