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Finding the Fourth Proportional to 855.98, 1,283.99 and 661.28

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Solution

The fourth proportional to 855.98, 1,283.99 and 661.28 is: 991.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.98 : 1,283.99 = 661.28 : x
  2. Step 2: Convert to fraction form
    855.98/1,283.99 = 661.28/x
  3. Step 3: Cross multiply
    855.98x = 1,283.99 × 661.28
  4. Step 4: Simplify right side
    855.98x = 849,074.40
  5. Step 5: Solve for x
    x = 849,074.40/855.98
  6. Step 6: Final answer
    x = 991.93

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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.