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Finding the Fourth Proportional to 780.44, 1,076.28 and 560.48

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Solution

The fourth proportional to 780.44, 1,076.28 and 560.48 is: 772.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.44 : 1,076.28 = 560.48 : x
  2. Step 2: Convert to fraction form
    780.44/1,076.28 = 560.48/x
  3. Step 3: Cross multiply
    780.44x = 1,076.28 × 560.48
  4. Step 4: Simplify right side
    780.44x = 603,233.41
  5. Step 5: Solve for x
    x = 603,233.41/780.44
  6. Step 6: Final answer
    x = 772.94

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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.