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Finding the Fourth Proportional to 780.89, 1,077.62 and 426.83

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Solution

The fourth proportional to 780.89, 1,077.62 and 426.83 is: 589.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.89 : 1,077.62 = 426.83 : x
  2. Step 2: Convert to fraction form
    780.89/1,077.62 = 426.83/x
  3. Step 3: Cross multiply
    780.89x = 1,077.62 × 426.83
  4. Step 4: Simplify right side
    780.89x = 459,953.02
  5. Step 5: Solve for x
    x = 459,953.02/780.89
  6. Step 6: Final answer
    x = 589.02

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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.