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Finding the Fourth Proportional to 986.78, 1,472.99 and 913.48

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Solution

The fourth proportional to 986.78, 1,472.99 and 913.48 is: 1,363.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.78 : 1,472.99 = 913.48 : x
  2. Step 2: Convert to fraction form
    986.78/1,472.99 = 913.48/x
  3. Step 3: Cross multiply
    986.78x = 1,472.99 × 913.48
  4. Step 4: Simplify right side
    986.78x = 1,345,538.66
  5. Step 5: Solve for x
    x = 1,345,538.66/986.78
  6. Step 6: Final answer
    x = 1,363.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.