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Finding the Fourth Proportional to 1,072.48, 1,480 and 630.40

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Solution

The fourth proportional to 1,072.48, 1,480 and 630.40 is: 869.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.48 : 1,480 = 630.40 : x
  2. Step 2: Convert to fraction form
    1,072.48/1,480 = 630.40/x
  3. Step 3: Cross multiply
    1,072.48x = 1,480 × 630.40
  4. Step 4: Simplify right side
    1,072.48x = 932,992
  5. Step 5: Solve for x
    x = 932,992/1,072.48
  6. Step 6: Final answer
    x = 869.94

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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.