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Finding the Fourth Proportional to 700.92, 1,055.22 and 641.40

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Solution

The fourth proportional to 700.92, 1,055.22 and 641.40 is: 965.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.92 : 1,055.22 = 641.40 : x
  2. Step 2: Convert to fraction form
    700.92/1,055.22 = 641.40/x
  3. Step 3: Cross multiply
    700.92x = 1,055.22 × 641.40
  4. Step 4: Simplify right side
    700.92x = 676,818.11
  5. Step 5: Solve for x
    x = 676,818.11/700.92
  6. Step 6: Final answer
    x = 965.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.