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Finding the Fourth Proportional to 1,872.42, 2,809.35 and 776.50

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Solution

The fourth proportional to 1,872.42, 2,809.35 and 776.50 is: 1,165.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,872.42 : 2,809.35 = 776.50 : x
  2. Step 2: Convert to fraction form
    1,872.42/2,809.35 = 776.50/x
  3. Step 3: Cross multiply
    1,872.42x = 2,809.35 × 776.50
  4. Step 4: Simplify right side
    1,872.42x = 2,181,460.28
  5. Step 5: Solve for x
    x = 2,181,460.28/1,872.42
  6. Step 6: Final answer
    x = 1,165.05

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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.