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Finding the Fourth Proportional to 1,281.10, 1,921.41 and 767.50

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Solution

The fourth proportional to 1,281.10, 1,921.41 and 767.50 is: 1,151.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.10 : 1,921.41 = 767.50 : x
  2. Step 2: Convert to fraction form
    1,281.10/1,921.41 = 767.50/x
  3. Step 3: Cross multiply
    1,281.10x = 1,921.41 × 767.50
  4. Step 4: Simplify right side
    1,281.10x = 1,474,682.18
  5. Step 5: Solve for x
    x = 1,474,682.18/1,281.10
  6. Step 6: Final answer
    x = 1,151.11

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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.