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Finding the Fourth Proportional to 705.23, 1,055.71 and 640.23

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Solution

The fourth proportional to 705.23, 1,055.71 and 640.23 is: 958.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.23 : 1,055.71 = 640.23 : x
  2. Step 2: Convert to fraction form
    705.23/1,055.71 = 640.23/x
  3. Step 3: Cross multiply
    705.23x = 1,055.71 × 640.23
  4. Step 4: Simplify right side
    705.23x = 675,897.21
  5. Step 5: Solve for x
    x = 675,897.21/705.23
  6. Step 6: Final answer
    x = 958.41

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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.