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Finding the Fourth Proportional to 1,285.51, 1,772.82 and 859.39

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Solution

The fourth proportional to 1,285.51, 1,772.82 and 859.39 is: 1,185.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.51 : 1,772.82 = 859.39 : x
  2. Step 2: Convert to fraction form
    1,285.51/1,772.82 = 859.39/x
  3. Step 3: Cross multiply
    1,285.51x = 1,772.82 × 859.39
  4. Step 4: Simplify right side
    1,285.51x = 1,523,543.78
  5. Step 5: Solve for x
    x = 1,523,543.78/1,285.51
  6. Step 6: Final answer
    x = 1,185.17

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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.