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Finding the Fourth Proportional to 918.45, 1,266.69 and 818.94

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Solution

The fourth proportional to 918.45, 1,266.69 and 818.94 is: 1,129.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.45 : 1,266.69 = 818.94 : x
  2. Step 2: Convert to fraction form
    918.45/1,266.69 = 818.94/x
  3. Step 3: Cross multiply
    918.45x = 1,266.69 × 818.94
  4. Step 4: Simplify right side
    918.45x = 1,037,343.11
  5. Step 5: Solve for x
    x = 1,037,343.11/918.45
  6. Step 6: Final answer
    x = 1,129.45

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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.