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Finding the Fourth Proportional to 1,285.87, 1,928.58 and 555.25

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Solution

The fourth proportional to 1,285.87, 1,928.58 and 555.25 is: 832.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.87 : 1,928.58 = 555.25 : x
  2. Step 2: Convert to fraction form
    1,285.87/1,928.58 = 555.25/x
  3. Step 3: Cross multiply
    1,285.87x = 1,928.58 × 555.25
  4. Step 4: Simplify right side
    1,285.87x = 1,070,844.05
  5. Step 5: Solve for x
    x = 1,070,844.05/1,285.87
  6. Step 6: Final answer
    x = 832.78

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Double scale
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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.