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Finding the Fourth Proportional to 780.91, 1,077.66 and 431.60

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Solution

The fourth proportional to 780.91, 1,077.66 and 431.60 is: 595.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.91 : 1,077.66 = 431.60 : x
  2. Step 2: Convert to fraction form
    780.91/1,077.66 = 431.60/x
  3. Step 3: Cross multiply
    780.91x = 1,077.66 × 431.60
  4. Step 4: Simplify right side
    780.91x = 465,115.36
  5. Step 5: Solve for x
    x = 465,115.36/780.91
  6. Step 6: Final answer
    x = 595.61

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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.