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Finding the Fourth Proportional to 859.97, 1,186.55 and 486.87

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Solution

The fourth proportional to 859.97, 1,186.55 and 486.87 is: 671.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.97 : 1,186.55 = 486.87 : x
  2. Step 2: Convert to fraction form
    859.97/1,186.55 = 486.87/x
  3. Step 3: Cross multiply
    859.97x = 1,186.55 × 486.87
  4. Step 4: Simplify right side
    859.97x = 577,689.67
  5. Step 5: Solve for x
    x = 577,689.67/859.97
  6. Step 6: Final answer
    x = 671.76

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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.