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Finding the Fourth Proportional to 780.38, 1,076.66 and 444.25

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Solution

The fourth proportional to 780.38, 1,076.66 and 444.25 is: 612.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.38 : 1,076.66 = 444.25 : x
  2. Step 2: Convert to fraction form
    780.38/1,076.66 = 444.25/x
  3. Step 3: Cross multiply
    780.38x = 1,076.66 × 444.25
  4. Step 4: Simplify right side
    780.38x = 478,306.21
  5. Step 5: Solve for x
    x = 478,306.21/780.38
  6. Step 6: Final answer
    x = 612.91

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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.