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Finding the Fourth Proportional to 1,060.56, 1,463.20 and 640.80

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Solution

The fourth proportional to 1,060.56, 1,463.20 and 640.80 is: 884.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,060.56 : 1,463.20 = 640.80 : x
  2. Step 2: Convert to fraction form
    1,060.56/1,463.20 = 640.80/x
  3. Step 3: Cross multiply
    1,060.56x = 1,463.20 × 640.80
  4. Step 4: Simplify right side
    1,060.56x = 937,618.56
  5. Step 5: Solve for x
    x = 937,618.56/1,060.56
  6. Step 6: Final answer
    x = 884.08

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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.