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Finding the Fourth Proportional to 905.23, 1,247.85 and 708.40

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Solution

The fourth proportional to 905.23, 1,247.85 and 708.40 is: 976.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.23 : 1,247.85 = 708.40 : x
  2. Step 2: Convert to fraction form
    905.23/1,247.85 = 708.40/x
  3. Step 3: Cross multiply
    905.23x = 1,247.85 × 708.40
  4. Step 4: Simplify right side
    905.23x = 883,967.16
  5. Step 5: Solve for x
    x = 883,967.16/905.23
  6. Step 6: Final answer
    x = 976.52

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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.