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Finding the Fourth Proportional to 613.88, 919.56 and 458

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Solution

The fourth proportional to 613.88, 919.56 and 458 is: 686.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.88 : 919.56 = 458 : x
  2. Step 2: Convert to fraction form
    613.88/919.56 = 458/x
  3. Step 3: Cross multiply
    613.88x = 919.56 × 458
  4. Step 4: Simplify right side
    613.88x = 421,158.48
  5. Step 5: Solve for x
    x = 421,158.48/613.88
  6. Step 6: Final answer
    x = 686.06

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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.