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Finding the Fourth Proportional to 823.10, 1,235.47 and 499.10

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Solution

The fourth proportional to 823.10, 1,235.47 and 499.10 is: 749.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.10 : 1,235.47 = 499.10 : x
  2. Step 2: Convert to fraction form
    823.10/1,235.47 = 499.10/x
  3. Step 3: Cross multiply
    823.10x = 1,235.47 × 499.10
  4. Step 4: Simplify right side
    823.10x = 616,623.08
  5. Step 5: Solve for x
    x = 616,623.08/823.10
  6. Step 6: Final answer
    x = 749.15

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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.