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Finding the Fourth Proportional to 787.64, 1,180.20 and 571.34

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Solution

The fourth proportional to 787.64, 1,180.20 and 571.34 is: 856.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.64 : 1,180.20 = 571.34 : x
  2. Step 2: Convert to fraction form
    787.64/1,180.20 = 571.34/x
  3. Step 3: Cross multiply
    787.64x = 1,180.20 × 571.34
  4. Step 4: Simplify right side
    787.64x = 674,295.47
  5. Step 5: Solve for x
    x = 674,295.47/787.64
  6. Step 6: Final answer
    x = 856.10

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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.