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Finding the Fourth Proportional to 1,478.06, 2,217.47 and 553.69

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Solution

The fourth proportional to 1,478.06, 2,217.47 and 553.69 is: 830.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.06 : 2,217.47 = 553.69 : x
  2. Step 2: Convert to fraction form
    1,478.06/2,217.47 = 553.69/x
  3. Step 3: Cross multiply
    1,478.06x = 2,217.47 × 553.69
  4. Step 4: Simplify right side
    1,478.06x = 1,227,790.96
  5. Step 5: Solve for x
    x = 1,227,790.96/1,478.06
  6. Step 6: Final answer
    x = 830.68

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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.