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Finding the Fourth Proportional to 918.17, 1,379.12 and 810.91

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Solution

The fourth proportional to 918.17, 1,379.12 and 810.91 is: 1,218.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.17 : 1,379.12 = 810.91 : x
  2. Step 2: Convert to fraction form
    918.17/1,379.12 = 810.91/x
  3. Step 3: Cross multiply
    918.17x = 1,379.12 × 810.91
  4. Step 4: Simplify right side
    918.17x = 1,118,349.45
  5. Step 5: Solve for x
    x = 1,118,349.45/918.17
  6. Step 6: Final answer
    x = 1,218.02

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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.