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Finding the Fourth Proportional to 1,186.71, 1,778.51 and 858.75

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Solution

The fourth proportional to 1,186.71, 1,778.51 and 858.75 is: 1,287.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.71 : 1,778.51 = 858.75 : x
  2. Step 2: Convert to fraction form
    1,186.71/1,778.51 = 858.75/x
  3. Step 3: Cross multiply
    1,186.71x = 1,778.51 × 858.75
  4. Step 4: Simplify right side
    1,186.71x = 1,527,296.11
  5. Step 5: Solve for x
    x = 1,527,296.11/1,186.71
  6. Step 6: Final answer
    x = 1,287.00

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.