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Finding the Fourth Proportional to 1,016.88, 1,403.88 and 706.80

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Solution

The fourth proportional to 1,016.88, 1,403.88 and 706.80 is: 975.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.88 : 1,403.88 = 706.80 : x
  2. Step 2: Convert to fraction form
    1,016.88/1,403.88 = 706.80/x
  3. Step 3: Cross multiply
    1,016.88x = 1,403.88 × 706.80
  4. Step 4: Simplify right side
    1,016.88x = 992,262.38
  5. Step 5: Solve for x
    x = 992,262.38/1,016.88
  6. Step 6: Final answer
    x = 975.79

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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.