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Finding the Fourth Proportional to 2,590.53, 3,886.20 and 858.75

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Solution

The fourth proportional to 2,590.53, 3,886.20 and 858.75 is: 1,288.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,590.53 : 3,886.20 = 858.75 : x
  2. Step 2: Convert to fraction form
    2,590.53/3,886.20 = 858.75/x
  3. Step 3: Cross multiply
    2,590.53x = 3,886.20 × 858.75
  4. Step 4: Simplify right side
    2,590.53x = 3,337,274.25
  5. Step 5: Solve for x
    x = 3,337,274.25/2,590.53
  6. Step 6: Final answer
    x = 1,288.26

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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.