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Finding the Fourth Proportional to 787.92, 1,087.80 and 555.28

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Solution

The fourth proportional to 787.92, 1,087.80 and 555.28 is: 766.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.92 : 1,087.80 = 555.28 : x
  2. Step 2: Convert to fraction form
    787.92/1,087.80 = 555.28/x
  3. Step 3: Cross multiply
    787.92x = 1,087.80 × 555.28
  4. Step 4: Simplify right side
    787.92x = 604,033.58
  5. Step 5: Solve for x
    x = 604,033.58/787.92
  6. Step 6: Final answer
    x = 766.62

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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.