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Finding the Fourth Proportional to 2,380.71, 3,570.70 and 820.47

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Solution

The fourth proportional to 2,380.71, 3,570.70 and 820.47 is: 1,230.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,380.71 : 3,570.70 = 820.47 : x
  2. Step 2: Convert to fraction form
    2,380.71/3,570.70 = 820.47/x
  3. Step 3: Cross multiply
    2,380.71x = 3,570.70 × 820.47
  4. Step 4: Simplify right side
    2,380.71x = 2,929,652.23
  5. Step 5: Solve for x
    x = 2,929,652.23/2,380.71
  6. Step 6: Final answer
    x = 1,230.58

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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.