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Finding the Fourth Proportional to 2,590.70, 3,886.34 and 859.32

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Solution

The fourth proportional to 2,590.70, 3,886.34 and 859.32 is: 1,289.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,590.70 : 3,886.34 = 859.32 : x
  2. Step 2: Convert to fraction form
    2,590.70/3,886.34 = 859.32/x
  3. Step 3: Cross multiply
    2,590.70x = 3,886.34 × 859.32
  4. Step 4: Simplify right side
    2,590.70x = 3,339,605.39
  5. Step 5: Solve for x
    x = 3,339,605.39/2,590.70
  6. Step 6: Final answer
    x = 1,289.08

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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.