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Finding the Fourth Proportional to 918.92, 1,376.93 and 641.00

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Solution

The fourth proportional to 918.92, 1,376.93 and 641.00 is: 960.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.92 : 1,376.93 = 641.00 : x
  2. Step 2: Convert to fraction form
    918.92/1,376.93 = 641.00/x
  3. Step 3: Cross multiply
    918.92x = 1,376.93 × 641.00
  4. Step 4: Simplify right side
    918.92x = 882,606.85
  5. Step 5: Solve for x
    x = 882,606.85/918.92
  6. Step 6: Final answer
    x = 960.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.