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Finding the Fourth Proportional to 921.50, 1,271.67 and 553.50

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Solution

The fourth proportional to 921.50, 1,271.67 and 553.50 is: 763.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.50 : 1,271.67 = 553.50 : x
  2. Step 2: Convert to fraction form
    921.50/1,271.67 = 553.50/x
  3. Step 3: Cross multiply
    921.50x = 1,271.67 × 553.50
  4. Step 4: Simplify right side
    921.50x = 703,869.35
  5. Step 5: Solve for x
    x = 703,869.35/921.50
  6. Step 6: Final answer
    x = 763.83

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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.