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Finding the Fourth Proportional to 823.40, 1,234.96 and 412.10

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Solution

The fourth proportional to 823.40, 1,234.96 and 412.10 is: 618.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.40 : 1,234.96 = 412.10 : x
  2. Step 2: Convert to fraction form
    823.40/1,234.96 = 412.10/x
  3. Step 3: Cross multiply
    823.40x = 1,234.96 × 412.10
  4. Step 4: Simplify right side
    823.40x = 508,927.02
  5. Step 5: Solve for x
    x = 508,927.02/823.40
  6. Step 6: Final answer
    x = 618.08

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Double scale
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1.5x scale

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.