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Finding the Fourth Proportional to 1,477.71, 2,217.94 and 747.80

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Solution

The fourth proportional to 1,477.71, 2,217.94 and 747.80 is: 1,122.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,477.71 : 2,217.94 = 747.80 : x
  2. Step 2: Convert to fraction form
    1,477.71/2,217.94 = 747.80/x
  3. Step 3: Cross multiply
    1,477.71x = 2,217.94 × 747.80
  4. Step 4: Simplify right side
    1,477.71x = 1,658,579.21
  5. Step 5: Solve for x
    x = 1,658,579.21/1,477.71
  6. Step 6: Final answer
    x = 1,122.40

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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.