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Finding the Fourth Proportional to 918.37, 1,379.22 and 877.87

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Solution

The fourth proportional to 918.37, 1,379.22 and 877.87 is: 1,318.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.37 : 1,379.22 = 877.87 : x
  2. Step 2: Convert to fraction form
    918.37/1,379.22 = 877.87/x
  3. Step 3: Cross multiply
    918.37x = 1,379.22 × 877.87
  4. Step 4: Simplify right side
    918.37x = 1,210,775.86
  5. Step 5: Solve for x
    x = 1,210,775.86/918.37
  6. Step 6: Final answer
    x = 1,318.40

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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.