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Finding the Fourth Proportional to 1,285.20, 1,774.40 and 843.89

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Solution

The fourth proportional to 1,285.20, 1,774.40 and 843.89 is: 1,165.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.20 : 1,774.40 = 843.89 : x
  2. Step 2: Convert to fraction form
    1,285.20/1,774.40 = 843.89/x
  3. Step 3: Cross multiply
    1,285.20x = 1,774.40 × 843.89
  4. Step 4: Simplify right side
    1,285.20x = 1,497,385.32
  5. Step 5: Solve for x
    x = 1,497,385.32/1,285.20
  6. Step 6: Final answer
    x = 1,165.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.