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Finding the Fourth Proportional to 919.98, 1,380.17 and 458.01

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Solution

The fourth proportional to 919.98, 1,380.17 and 458.01 is: 687.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.98 : 1,380.17 = 458.01 : x
  2. Step 2: Convert to fraction form
    919.98/1,380.17 = 458.01/x
  3. Step 3: Cross multiply
    919.98x = 1,380.17 × 458.01
  4. Step 4: Simplify right side
    919.98x = 632,131.66
  5. Step 5: Solve for x
    x = 632,131.66/919.98
  6. Step 6: Final answer
    x = 687.11

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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.