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Finding the Fourth Proportional to 859.79, 1,186.64 and 486.92

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Solution

The fourth proportional to 859.79, 1,186.64 and 486.92 is: 672.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.79 : 1,186.64 = 486.92 : x
  2. Step 2: Convert to fraction form
    859.79/1,186.64 = 486.92/x
  3. Step 3: Cross multiply
    859.79x = 1,186.64 × 486.92
  4. Step 4: Simplify right side
    859.79x = 577,796.31
  5. Step 5: Solve for x
    x = 577,796.31/859.79
  6. Step 6: Final answer
    x = 672.02

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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.