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Finding the Fourth Proportional to 921.84, 1,380.16 and 704.76

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Solution

The fourth proportional to 921.84, 1,380.16 and 704.76 is: 1,055.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.84 : 1,380.16 = 704.76 : x
  2. Step 2: Convert to fraction form
    921.84/1,380.16 = 704.76/x
  3. Step 3: Cross multiply
    921.84x = 1,380.16 × 704.76
  4. Step 4: Simplify right side
    921.84x = 972,681.56
  5. Step 5: Solve for x
    x = 972,681.56/921.84
  6. Step 6: Final answer
    x = 1,055.15

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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.