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Finding the Fourth Proportional to 1,384.74, 1,910.70 and 787.23

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Solution

The fourth proportional to 1,384.74, 1,910.70 and 787.23 is: 1,086.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.74 : 1,910.70 = 787.23 : x
  2. Step 2: Convert to fraction form
    1,384.74/1,910.70 = 787.23/x
  3. Step 3: Cross multiply
    1,384.74x = 1,910.70 × 787.23
  4. Step 4: Simplify right side
    1,384.74x = 1,504,160.36
  5. Step 5: Solve for x
    x = 1,504,160.36/1,384.74
  6. Step 6: Final answer
    x = 1,086.24

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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.