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Finding the Fourth Proportional to 1,338.10, 2,006.70 and 472.21

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Solution

The fourth proportional to 1,338.10, 2,006.70 and 472.21 is: 708.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.10 : 2,006.70 = 472.21 : x
  2. Step 2: Convert to fraction form
    1,338.10/2,006.70 = 472.21/x
  3. Step 3: Cross multiply
    1,338.10x = 2,006.70 × 472.21
  4. Step 4: Simplify right side
    1,338.10x = 947,583.81
  5. Step 5: Solve for x
    x = 947,583.81/1,338.10
  6. Step 6: Final answer
    x = 708.16

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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.