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Finding the Fourth Proportional to 921.56, 1,380.50 and 457.94

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Solution

The fourth proportional to 921.56, 1,380.50 and 457.94 is: 686.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.56 : 1,380.50 = 457.94 : x
  2. Step 2: Convert to fraction form
    921.56/1,380.50 = 457.94/x
  3. Step 3: Cross multiply
    921.56x = 1,380.50 × 457.94
  4. Step 4: Simplify right side
    921.56x = 632,187.33
  5. Step 5: Solve for x
    x = 632,187.33/921.56
  6. Step 6: Final answer
    x = 686.00

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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.