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Finding the Fourth Proportional to 1,478.07, 2,217.56 and 553.73

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Solution

The fourth proportional to 1,478.07, 2,217.56 and 553.73 is: 830.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.07 : 2,217.56 = 553.73 : x
  2. Step 2: Convert to fraction form
    1,478.07/2,217.56 = 553.73/x
  3. Step 3: Cross multiply
    1,478.07x = 2,217.56 × 553.73
  4. Step 4: Simplify right side
    1,478.07x = 1,227,915.64
  5. Step 5: Solve for x
    x = 1,227,915.64/1,478.07
  6. Step 6: Final answer
    x = 830.76

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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.