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Finding the Fourth Proportional to 823.16, 1,234.89 and 275.40

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Solution

The fourth proportional to 823.16, 1,234.89 and 275.40 is: 413.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.16 : 1,234.89 = 275.40 : x
  2. Step 2: Convert to fraction form
    823.16/1,234.89 = 275.40/x
  3. Step 3: Cross multiply
    823.16x = 1,234.89 × 275.40
  4. Step 4: Simplify right side
    823.16x = 340,088.71
  5. Step 5: Solve for x
    x = 340,088.71/823.16
  6. Step 6: Final answer
    x = 413.15

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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.