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Finding the Fourth Proportional to 1,247.23, 1,720.80 and 723.16

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Solution

The fourth proportional to 1,247.23, 1,720.80 and 723.16 is: 997.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.23 : 1,720.80 = 723.16 : x
  2. Step 2: Convert to fraction form
    1,247.23/1,720.80 = 723.16/x
  3. Step 3: Cross multiply
    1,247.23x = 1,720.80 × 723.16
  4. Step 4: Simplify right side
    1,247.23x = 1,244,413.73
  5. Step 5: Solve for x
    x = 1,244,413.73/1,247.23
  6. Step 6: Final answer
    x = 997.74

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1.5x scale

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.