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Finding the Fourth Proportional to 918.09, 1,379.70 and 631.35

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Solution

The fourth proportional to 918.09, 1,379.70 and 631.35 is: 948.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.09 : 1,379.70 = 631.35 : x
  2. Step 2: Convert to fraction form
    918.09/1,379.70 = 631.35/x
  3. Step 3: Cross multiply
    918.09x = 1,379.70 × 631.35
  4. Step 4: Simplify right side
    918.09x = 871,073.60
  5. Step 5: Solve for x
    x = 871,073.60/918.09
  6. Step 6: Final answer
    x = 948.79

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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.