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Finding the Fourth Proportional to 787.64, 1,180.54 and 318.92

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Solution

The fourth proportional to 787.64, 1,180.54 and 318.92 is: 478.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.64 : 1,180.54 = 318.92 : x
  2. Step 2: Convert to fraction form
    787.64/1,180.54 = 318.92/x
  3. Step 3: Cross multiply
    787.64x = 1,180.54 × 318.92
  4. Step 4: Simplify right side
    787.64x = 376,497.82
  5. Step 5: Solve for x
    x = 376,497.82/787.64
  6. Step 6: Final answer
    x = 478.01

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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.