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Finding the Fourth Proportional to 858.68, 1,179.80 and 683.72

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Solution

The fourth proportional to 858.68, 1,179.80 and 683.72 is: 939.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.68 : 1,179.80 = 683.72 : x
  2. Step 2: Convert to fraction form
    858.68/1,179.80 = 683.72/x
  3. Step 3: Cross multiply
    858.68x = 1,179.80 × 683.72
  4. Step 4: Simplify right side
    858.68x = 806,652.86
  5. Step 5: Solve for x
    x = 806,652.86/858.68
  6. Step 6: Final answer
    x = 939.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.