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Finding the Fourth Proportional to 832.45, 1,247.79 and 626.40

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Solution

The fourth proportional to 832.45, 1,247.79 and 626.40 is: 938.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.45 : 1,247.79 = 626.40 : x
  2. Step 2: Convert to fraction form
    832.45/1,247.79 = 626.40/x
  3. Step 3: Cross multiply
    832.45x = 1,247.79 × 626.40
  4. Step 4: Simplify right side
    832.45x = 781,615.66
  5. Step 5: Solve for x
    x = 781,615.66/832.45
  6. Step 6: Final answer
    x = 938.93

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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.