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Finding the Fourth Proportional to 860.14, 1,186.98 and 487.11

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Solution

The fourth proportional to 860.14, 1,186.98 and 487.11 is: 672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.14 : 1,186.98 = 487.11 : x
  2. Step 2: Convert to fraction form
    860.14/1,186.98 = 487.11/x
  3. Step 3: Cross multiply
    860.14x = 1,186.98 × 487.11
  4. Step 4: Simplify right side
    860.14x = 578,185.86
  5. Step 5: Solve for x
    x = 578,185.86/860.14
  6. Step 6: Final answer
    x = 672.20

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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.