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Finding the Fourth Proportional to 780.63, 1,077.29 and 426.56

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Solution

The fourth proportional to 780.63, 1,077.29 and 426.56 is: 588.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.63 : 1,077.29 = 426.56 : x
  2. Step 2: Convert to fraction form
    780.63/1,077.29 = 426.56/x
  3. Step 3: Cross multiply
    780.63x = 1,077.29 × 426.56
  4. Step 4: Simplify right side
    780.63x = 459,521.30
  5. Step 5: Solve for x
    x = 459,521.30/780.63
  6. Step 6: Final answer
    x = 588.65

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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.