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Finding the Fourth Proportional to 780.26, 1,169.80 and 472.05

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Solution

The fourth proportional to 780.26, 1,169.80 and 472.05 is: 707.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.26 : 1,169.80 = 472.05 : x
  2. Step 2: Convert to fraction form
    780.26/1,169.80 = 472.05/x
  3. Step 3: Cross multiply
    780.26x = 1,169.80 × 472.05
  4. Step 4: Simplify right side
    780.26x = 552,198.24
  5. Step 5: Solve for x
    x = 552,198.24/780.26
  6. Step 6: Final answer
    x = 707.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.