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Finding the Fourth Proportional to 955.62, 1,319.36 and 641.30

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Solution

The fourth proportional to 955.62, 1,319.36 and 641.30 is: 885.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.62 : 1,319.36 = 641.30 : x
  2. Step 2: Convert to fraction form
    955.62/1,319.36 = 641.30/x
  3. Step 3: Cross multiply
    955.62x = 1,319.36 × 641.30
  4. Step 4: Simplify right side
    955.62x = 846,095.76
  5. Step 5: Solve for x
    x = 846,095.76/955.62
  6. Step 6: Final answer
    x = 885.39

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Double scale
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1.5x scale

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.