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Finding the Fourth Proportional to 612.80, 919.56 and 586.70

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Solution

The fourth proportional to 612.80, 919.56 and 586.70 is: 880.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.80 : 919.56 = 586.70 : x
  2. Step 2: Convert to fraction form
    612.80/919.56 = 586.70/x
  3. Step 3: Cross multiply
    612.80x = 919.56 × 586.70
  4. Step 4: Simplify right side
    612.80x = 539,505.85
  5. Step 5: Solve for x
    x = 539,505.85/612.80
  6. Step 6: Final answer
    x = 880.39

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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.