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Finding the Fourth Proportional to 1,054.69, 1,579.97 and 642.80

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Solution

The fourth proportional to 1,054.69, 1,579.97 and 642.80 is: 962.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,054.69 : 1,579.97 = 642.80 : x
  2. Step 2: Convert to fraction form
    1,054.69/1,579.97 = 642.80/x
  3. Step 3: Cross multiply
    1,054.69x = 1,579.97 × 642.80
  4. Step 4: Simplify right side
    1,054.69x = 1,015,610.27
  5. Step 5: Solve for x
    x = 1,015,610.27/1,054.69
  6. Step 6: Final answer
    x = 962.95

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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.