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Finding the Fourth Proportional to 821.32, 1,133.86 and 555.96

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Solution

The fourth proportional to 821.32, 1,133.86 and 555.96 is: 767.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.32 : 1,133.86 = 555.96 : x
  2. Step 2: Convert to fraction form
    821.32/1,133.86 = 555.96/x
  3. Step 3: Cross multiply
    821.32x = 1,133.86 × 555.96
  4. Step 4: Simplify right side
    821.32x = 630,380.81
  5. Step 5: Solve for x
    x = 630,380.81/821.32
  6. Step 6: Final answer
    x = 767.52

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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.