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Finding the Fourth Proportional to 955.54, 1,318.98 and 640.18

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Solution

The fourth proportional to 955.54, 1,318.98 and 640.18 is: 883.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.54 : 1,318.98 = 640.18 : x
  2. Step 2: Convert to fraction form
    955.54/1,318.98 = 640.18/x
  3. Step 3: Cross multiply
    955.54x = 1,318.98 × 640.18
  4. Step 4: Simplify right side
    955.54x = 844,384.62
  5. Step 5: Solve for x
    x = 844,384.62/955.54
  6. Step 6: Final answer
    x = 883.67

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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.