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Finding the Fourth Proportional to 2,590.20, 3,886.20 and 1,129.80

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Solution

The fourth proportional to 2,590.20, 3,886.20 and 1,129.80 is: 1,695.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,590.20 : 3,886.20 = 1,129.80 : x
  2. Step 2: Convert to fraction form
    2,590.20/3,886.20 = 1,129.80/x
  3. Step 3: Cross multiply
    2,590.20x = 3,886.20 × 1,129.80
  4. Step 4: Simplify right side
    2,590.20x = 4,390,628.76
  5. Step 5: Solve for x
    x = 4,390,628.76/2,590.20
  6. Step 6: Final answer
    x = 1,695.09

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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.