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Finding the Fourth Proportional to 787.76, 1,180.56 and 353.90

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Solution

The fourth proportional to 787.76, 1,180.56 and 353.90 is: 530.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.76 : 1,180.56 = 353.90 : x
  2. Step 2: Convert to fraction form
    787.76/1,180.56 = 353.90/x
  3. Step 3: Cross multiply
    787.76x = 1,180.56 × 353.90
  4. Step 4: Simplify right side
    787.76x = 417,800.18
  5. Step 5: Solve for x
    x = 417,800.18/787.76
  6. Step 6: Final answer
    x = 530.36

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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.