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Finding the Fourth Proportional to 1,654.12, 2,478.87 and 775.68

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Solution

The fourth proportional to 1,654.12, 2,478.87 and 775.68 is: 1,162.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,654.12 : 2,478.87 = 775.68 : x
  2. Step 2: Convert to fraction form
    1,654.12/2,478.87 = 775.68/x
  3. Step 3: Cross multiply
    1,654.12x = 2,478.87 × 775.68
  4. Step 4: Simplify right side
    1,654.12x = 1,922,809.88
  5. Step 5: Solve for x
    x = 1,922,809.88/1,654.12
  6. Step 6: Final answer
    x = 1,162.44

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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.