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Finding the Fourth Proportional to 860.12, 1,186.62 and 487

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Solution

The fourth proportional to 860.12, 1,186.62 and 487 is: 671.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.12 : 1,186.62 = 487 : x
  2. Step 2: Convert to fraction form
    860.12/1,186.62 = 487/x
  3. Step 3: Cross multiply
    860.12x = 1,186.62 × 487
  4. Step 4: Simplify right side
    860.12x = 577,883.94
  5. Step 5: Solve for x
    x = 577,883.94/860.12
  6. Step 6: Final answer
    x = 671.86

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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.