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Finding the Fourth Proportional to 780.39, 1,076.04 and 583.56

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Solution

The fourth proportional to 780.39, 1,076.04 and 583.56 is: 804.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.39 : 1,076.04 = 583.56 : x
  2. Step 2: Convert to fraction form
    780.39/1,076.04 = 583.56/x
  3. Step 3: Cross multiply
    780.39x = 1,076.04 × 583.56
  4. Step 4: Simplify right side
    780.39x = 627,933.90
  5. Step 5: Solve for x
    x = 627,933.90/780.39
  6. Step 6: Final answer
    x = 804.64

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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.