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Finding the Fourth Proportional to 2,359.80, 3,539.70 and 820.80

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Solution

The fourth proportional to 2,359.80, 3,539.70 and 820.80 is: 1,231.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,359.80 : 3,539.70 = 820.80 : x
  2. Step 2: Convert to fraction form
    2,359.80/3,539.70 = 820.80/x
  3. Step 3: Cross multiply
    2,359.80x = 3,539.70 × 820.80
  4. Step 4: Simplify right side
    2,359.80x = 2,905,385.76
  5. Step 5: Solve for x
    x = 2,905,385.76/2,359.80
  6. Step 6: Final answer
    x = 1,231.20

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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.