Home / 820.07-1,131.80-470.75

Finding the Fourth Proportional to 820.07, 1,131.80 and 470.75

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Solution

The fourth proportional to 820.07, 1,131.80 and 470.75 is: 649.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.07 : 1,131.80 = 470.75 : x
  2. Step 2: Convert to fraction form
    820.07/1,131.80 = 470.75/x
  3. Step 3: Cross multiply
    820.07x = 1,131.80 × 470.75
  4. Step 4: Simplify right side
    820.07x = 532,794.85
  5. Step 5: Solve for x
    x = 532,794.85/820.07
  6. Step 6: Final answer
    x = 649.69

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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.