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Finding the Fourth Proportional to 918.99, 1,369.62 and 911.34

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Solution

The fourth proportional to 918.99, 1,369.62 and 911.34 is: 1,358.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.99 : 1,369.62 = 911.34 : x
  2. Step 2: Convert to fraction form
    918.99/1,369.62 = 911.34/x
  3. Step 3: Cross multiply
    918.99x = 1,369.62 × 911.34
  4. Step 4: Simplify right side
    918.99x = 1,248,189.49
  5. Step 5: Solve for x
    x = 1,248,189.49/918.99
  6. Step 6: Final answer
    x = 1,358.22

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.