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Finding the Fourth Proportional to 921.64, 1,380.62 and 556.24

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Solution

The fourth proportional to 921.64, 1,380.62 and 556.24 is: 833.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.64 : 1,380.62 = 556.24 : x
  2. Step 2: Convert to fraction form
    921.64/1,380.62 = 556.24/x
  3. Step 3: Cross multiply
    921.64x = 1,380.62 × 556.24
  4. Step 4: Simplify right side
    921.64x = 767,956.07
  5. Step 5: Solve for x
    x = 767,956.07/921.64
  6. Step 6: Final answer
    x = 833.25

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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.