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Finding the Fourth Proportional to 855.89, 1,282.65 and 625.31

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Solution

The fourth proportional to 855.89, 1,282.65 and 625.31 is: 937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.89 : 1,282.65 = 625.31 : x
  2. Step 2: Convert to fraction form
    855.89/1,282.65 = 625.31/x
  3. Step 3: Cross multiply
    855.89x = 1,282.65 × 625.31
  4. Step 4: Simplify right side
    855.89x = 802,053.87
  5. Step 5: Solve for x
    x = 802,053.87/855.89
  6. Step 6: Final answer
    x = 937.10

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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.