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Finding the Fourth Proportional to 780.54, 1,077.15 and 426.47

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Solution

The fourth proportional to 780.54, 1,077.15 and 426.47 is: 588.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.54 : 1,077.15 = 426.47 : x
  2. Step 2: Convert to fraction form
    780.54/1,077.15 = 426.47/x
  3. Step 3: Cross multiply
    780.54x = 1,077.15 × 426.47
  4. Step 4: Simplify right side
    780.54x = 459,372.16
  5. Step 5: Solve for x
    x = 459,372.16/780.54
  6. Step 6: Final answer
    x = 588.53

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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.