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Finding the Fourth Proportional to 860.13, 1,186.84 and 486.99

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Solution

The fourth proportional to 860.13, 1,186.84 and 486.99 is: 671.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.13 : 1,186.84 = 486.99 : x
  2. Step 2: Convert to fraction form
    860.13/1,186.84 = 486.99/x
  3. Step 3: Cross multiply
    860.13x = 1,186.84 × 486.99
  4. Step 4: Simplify right side
    860.13x = 577,979.21
  5. Step 5: Solve for x
    x = 577,979.21/860.13
  6. Step 6: Final answer
    x = 671.97

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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.