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Finding the Fourth Proportional to 1,299.12, 1,948.22 and 477.21

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Solution

The fourth proportional to 1,299.12, 1,948.22 and 477.21 is: 715.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.12 : 1,948.22 = 477.21 : x
  2. Step 2: Convert to fraction form
    1,299.12/1,948.22 = 477.21/x
  3. Step 3: Cross multiply
    1,299.12x = 1,948.22 × 477.21
  4. Step 4: Simplify right side
    1,299.12x = 929,707.68
  5. Step 5: Solve for x
    x = 929,707.68/1,299.12
  6. Step 6: Final answer
    x = 715.64

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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.