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Finding the Fourth Proportional to 780.59, 1,077.21 and 426.51

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Solution

The fourth proportional to 780.59, 1,077.21 and 426.51 is: 588.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.59 : 1,077.21 = 426.51 : x
  2. Step 2: Convert to fraction form
    780.59/1,077.21 = 426.51/x
  3. Step 3: Cross multiply
    780.59x = 1,077.21 × 426.51
  4. Step 4: Simplify right side
    780.59x = 459,440.84
  5. Step 5: Solve for x
    x = 459,440.84/780.59
  6. Step 6: Final answer
    x = 588.58

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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.