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Finding the Fourth Proportional to 712.23, 1,065.63 and 640.29

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Solution

The fourth proportional to 712.23, 1,065.63 and 640.29 is: 957.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.23 : 1,065.63 = 640.29 : x
  2. Step 2: Convert to fraction form
    712.23/1,065.63 = 640.29/x
  3. Step 3: Cross multiply
    712.23x = 1,065.63 × 640.29
  4. Step 4: Simplify right side
    712.23x = 682,312.23
  5. Step 5: Solve for x
    x = 682,312.23/712.23
  6. Step 6: Final answer
    x = 957.99

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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.