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Finding the Fourth Proportional to 1,478.75, 2,217.87 and 438.74

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Solution

The fourth proportional to 1,478.75, 2,217.87 and 438.74 is: 658.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.75 : 2,217.87 = 438.74 : x
  2. Step 2: Convert to fraction form
    1,478.75/2,217.87 = 438.74/x
  3. Step 3: Cross multiply
    1,478.75x = 2,217.87 × 438.74
  4. Step 4: Simplify right side
    1,478.75x = 973,068.28
  5. Step 5: Solve for x
    x = 973,068.28/1,478.75
  6. Step 6: Final answer
    x = 658.03

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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.