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Finding the Fourth Proportional to 855.10, 1,282.65 and 747.10

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Solution

The fourth proportional to 855.10, 1,282.65 and 747.10 is: 1,120.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.10 : 1,282.65 = 747.10 : x
  2. Step 2: Convert to fraction form
    855.10/1,282.65 = 747.10/x
  3. Step 3: Cross multiply
    855.10x = 1,282.65 × 747.10
  4. Step 4: Simplify right side
    855.10x = 958,267.82
  5. Step 5: Solve for x
    x = 958,267.82/855.10
  6. Step 6: Final answer
    x = 1,120.65

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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.