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Finding the Fourth Proportional to 860.70, 1,186.38 and 611.64

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Solution

The fourth proportional to 860.70, 1,186.38 and 611.64 is: 843.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.70 : 1,186.38 = 611.64 : x
  2. Step 2: Convert to fraction form
    860.70/1,186.38 = 611.64/x
  3. Step 3: Cross multiply
    860.70x = 1,186.38 × 611.64
  4. Step 4: Simplify right side
    860.70x = 725,637.46
  5. Step 5: Solve for x
    x = 725,637.46/860.70
  6. Step 6: Final answer
    x = 843.08

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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.