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Finding the Fourth Proportional to 1,001.76, 1,382.43 and 553.63

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Solution

The fourth proportional to 1,001.76, 1,382.43 and 553.63 is: 764.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.76 : 1,382.43 = 553.63 : x
  2. Step 2: Convert to fraction form
    1,001.76/1,382.43 = 553.63/x
  3. Step 3: Cross multiply
    1,001.76x = 1,382.43 × 553.63
  4. Step 4: Simplify right side
    1,001.76x = 765,355.41
  5. Step 5: Solve for x
    x = 765,355.41/1,001.76
  6. Step 6: Final answer
    x = 764.01

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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.