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Finding the Fourth Proportional to 859.62, 1,186.74 and 579.90

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Solution

The fourth proportional to 859.62, 1,186.74 and 579.90 is: 800.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.62 : 1,186.74 = 579.90 : x
  2. Step 2: Convert to fraction form
    859.62/1,186.74 = 579.90/x
  3. Step 3: Cross multiply
    859.62x = 1,186.74 × 579.90
  4. Step 4: Simplify right side
    859.62x = 688,190.53
  5. Step 5: Solve for x
    x = 688,190.53/859.62
  6. Step 6: Final answer
    x = 800.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.