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Finding the Fourth Proportional to 642.70, 959.11 and 573.48

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Solution

The fourth proportional to 642.70, 959.11 and 573.48 is: 855.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.70 : 959.11 = 573.48 : x
  2. Step 2: Convert to fraction form
    642.70/959.11 = 573.48/x
  3. Step 3: Cross multiply
    642.70x = 959.11 × 573.48
  4. Step 4: Simplify right side
    642.70x = 550,030.40
  5. Step 5: Solve for x
    x = 550,030.40/642.70
  6. Step 6: Final answer
    x = 855.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.