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Finding the Fourth Proportional to 672.22, 926.07 and 643.06

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Solution

The fourth proportional to 672.22, 926.07 and 643.06 is: 885.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.22 : 926.07 = 643.06 : x
  2. Step 2: Convert to fraction form
    672.22/926.07 = 643.06/x
  3. Step 3: Cross multiply
    672.22x = 926.07 × 643.06
  4. Step 4: Simplify right side
    672.22x = 595,518.57
  5. Step 5: Solve for x
    x = 595,518.57/672.22
  6. Step 6: Final answer
    x = 885.90

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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.