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Finding the Fourth Proportional to 2,539.68, 3,809.64 and 784.72

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Solution

The fourth proportional to 2,539.68, 3,809.64 and 784.72 is: 1,177.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,539.68 : 3,809.64 = 784.72 : x
  2. Step 2: Convert to fraction form
    2,539.68/3,809.64 = 784.72/x
  3. Step 3: Cross multiply
    2,539.68x = 3,809.64 × 784.72
  4. Step 4: Simplify right side
    2,539.68x = 2,989,500.70
  5. Step 5: Solve for x
    x = 2,989,500.70/2,539.68
  6. Step 6: Final answer
    x = 1,177.12

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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.