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Finding the Fourth Proportional to 956.63, 1,319.94 and 641.94

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Solution

The fourth proportional to 956.63, 1,319.94 and 641.94 is: 885.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.63 : 1,319.94 = 641.94 : x
  2. Step 2: Convert to fraction form
    956.63/1,319.94 = 641.94/x
  3. Step 3: Cross multiply
    956.63x = 1,319.94 × 641.94
  4. Step 4: Simplify right side
    956.63x = 847,322.28
  5. Step 5: Solve for x
    x = 847,322.28/956.63
  6. Step 6: Final answer
    x = 885.74

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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.