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Finding the Fourth Proportional to 1,285.19, 1,773.55 and 725.64

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Solution

The fourth proportional to 1,285.19, 1,773.55 and 725.64 is: 1,001.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.19 : 1,773.55 = 725.64 : x
  2. Step 2: Convert to fraction form
    1,285.19/1,773.55 = 725.64/x
  3. Step 3: Cross multiply
    1,285.19x = 1,773.55 × 725.64
  4. Step 4: Simplify right side
    1,285.19x = 1,286,963.66
  5. Step 5: Solve for x
    x = 1,286,963.66/1,285.19
  6. Step 6: Final answer
    x = 1,001.38

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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.