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Finding the Fourth Proportional to 2,339.82, 3,509.60 and 780.57

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Solution

The fourth proportional to 2,339.82, 3,509.60 and 780.57 is: 1,170.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,339.82 : 3,509.60 = 780.57 : x
  2. Step 2: Convert to fraction form
    2,339.82/3,509.60 = 780.57/x
  3. Step 3: Cross multiply
    2,339.82x = 3,509.60 × 780.57
  4. Step 4: Simplify right side
    2,339.82x = 2,739,484.57
  5. Step 5: Solve for x
    x = 2,739,484.57/2,339.82
  6. Step 6: Final answer
    x = 1,170.81

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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.