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Finding the Fourth Proportional to 860.13, 1,185.61 and 658.71

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Solution

The fourth proportional to 860.13, 1,185.61 and 658.71 is: 907.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.13 : 1,185.61 = 658.71 : x
  2. Step 2: Convert to fraction form
    860.13/1,185.61 = 658.71/x
  3. Step 3: Cross multiply
    860.13x = 1,185.61 × 658.71
  4. Step 4: Simplify right side
    860.13x = 780,969.87
  5. Step 5: Solve for x
    x = 780,969.87/860.13
  6. Step 6: Final answer
    x = 907.97

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Double scale
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1.5x scale

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.