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Finding the Fourth Proportional to 921.66, 1,381.05 and 488.22

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Solution

The fourth proportional to 921.66, 1,381.05 and 488.22 is: 731.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.66 : 1,381.05 = 488.22 : x
  2. Step 2: Convert to fraction form
    921.66/1,381.05 = 488.22/x
  3. Step 3: Cross multiply
    921.66x = 1,381.05 × 488.22
  4. Step 4: Simplify right side
    921.66x = 674,256.23
  5. Step 5: Solve for x
    x = 674,256.23/921.66
  6. Step 6: Final answer
    x = 731.57

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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.