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Finding the Fourth Proportional to 858.90, 1,185.66 and 579.32

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Solution

The fourth proportional to 858.90, 1,185.66 and 579.32 is: 799.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.90 : 1,185.66 = 579.32 : x
  2. Step 2: Convert to fraction form
    858.90/1,185.66 = 579.32/x
  3. Step 3: Cross multiply
    858.90x = 1,185.66 × 579.32
  4. Step 4: Simplify right side
    858.90x = 686,876.55
  5. Step 5: Solve for x
    x = 686,876.55/858.90
  6. Step 6: Final answer
    x = 799.72

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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.