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Finding the Fourth Proportional to 823.36, 1,135.59 and 528.65

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Solution

The fourth proportional to 823.36, 1,135.59 and 528.65 is: 729.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.36 : 1,135.59 = 528.65 : x
  2. Step 2: Convert to fraction form
    823.36/1,135.59 = 528.65/x
  3. Step 3: Cross multiply
    823.36x = 1,135.59 × 528.65
  4. Step 4: Simplify right side
    823.36x = 600,329.65
  5. Step 5: Solve for x
    x = 600,329.65/823.36
  6. Step 6: Final answer
    x = 729.13

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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.