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Finding the Fourth Proportional to 821.46, 1,133.55 and 472.17

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Solution

The fourth proportional to 821.46, 1,133.55 and 472.17 is: 651.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.46 : 1,133.55 = 472.17 : x
  2. Step 2: Convert to fraction form
    821.46/1,133.55 = 472.17/x
  3. Step 3: Cross multiply
    821.46x = 1,133.55 × 472.17
  4. Step 4: Simplify right side
    821.46x = 535,228.30
  5. Step 5: Solve for x
    x = 535,228.30/821.46
  6. Step 6: Final answer
    x = 651.56

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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.