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Finding the Fourth Proportional to 922.03, 1,379.80 and 643.03

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Solution

The fourth proportional to 922.03, 1,379.80 and 643.03 is: 962.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.03 : 1,379.80 = 643.03 : x
  2. Step 2: Convert to fraction form
    922.03/1,379.80 = 643.03/x
  3. Step 3: Cross multiply
    922.03x = 1,379.80 × 643.03
  4. Step 4: Simplify right side
    922.03x = 887,252.79
  5. Step 5: Solve for x
    x = 887,252.79/922.03
  6. Step 6: Final answer
    x = 962.28

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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.