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Finding the Fourth Proportional to 2,725.76, 4,089.32 and 777.98

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Solution

The fourth proportional to 2,725.76, 4,089.32 and 777.98 is: 1,167.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,725.76 : 4,089.32 = 777.98 : x
  2. Step 2: Convert to fraction form
    2,725.76/4,089.32 = 777.98/x
  3. Step 3: Cross multiply
    2,725.76x = 4,089.32 × 777.98
  4. Step 4: Simplify right side
    2,725.76x = 3,181,409.17
  5. Step 5: Solve for x
    x = 3,181,409.17/2,725.76
  6. Step 6: Final answer
    x = 1,167.16

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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.