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Finding the Fourth Proportional to 718.66, 1,072.22 and 640.70

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Solution

The fourth proportional to 718.66, 1,072.22 and 640.70 is: 955.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.66 : 1,072.22 = 640.70 : x
  2. Step 2: Convert to fraction form
    718.66/1,072.22 = 640.70/x
  3. Step 3: Cross multiply
    718.66x = 1,072.22 × 640.70
  4. Step 4: Simplify right side
    718.66x = 686,971.35
  5. Step 5: Solve for x
    x = 686,971.35/718.66
  6. Step 6: Final answer
    x = 955.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.