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Finding the Fourth Proportional to 919.71, 1,380.74 and 555.21

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Solution

The fourth proportional to 919.71, 1,380.74 and 555.21 is: 833.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.71 : 1,380.74 = 555.21 : x
  2. Step 2: Convert to fraction form
    919.71/1,380.74 = 555.21/x
  3. Step 3: Cross multiply
    919.71x = 1,380.74 × 555.21
  4. Step 4: Simplify right side
    919.71x = 766,597.88
  5. Step 5: Solve for x
    x = 766,597.88/919.71
  6. Step 6: Final answer
    x = 833.52

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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.