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Finding the Fourth Proportional to 956.06, 1,319.83 and 641.21

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Solution

The fourth proportional to 956.06, 1,319.83 and 641.21 is: 885.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.06 : 1,319.83 = 641.21 : x
  2. Step 2: Convert to fraction form
    956.06/1,319.83 = 641.21/x
  3. Step 3: Cross multiply
    956.06x = 1,319.83 × 641.21
  4. Step 4: Simplify right side
    956.06x = 846,284.14
  5. Step 5: Solve for x
    x = 846,284.14/956.06
  6. Step 6: Final answer
    x = 885.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.