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Finding the Fourth Proportional to 1,072.21, 1,479.32 and 630.13

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Solution

The fourth proportional to 1,072.21, 1,479.32 and 630.13 is: 869.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.21 : 1,479.32 = 630.13 : x
  2. Step 2: Convert to fraction form
    1,072.21/1,479.32 = 630.13/x
  3. Step 3: Cross multiply
    1,072.21x = 1,479.32 × 630.13
  4. Step 4: Simplify right side
    1,072.21x = 932,160.76
  5. Step 5: Solve for x
    x = 932,160.76/1,072.21
  6. Step 6: Final answer
    x = 869.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.