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Finding the Fourth Proportional to 918.35, 1,370.05 and 755.54

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Solution

The fourth proportional to 918.35, 1,370.05 and 755.54 is: 1,127.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.35 : 1,370.05 = 755.54 : x
  2. Step 2: Convert to fraction form
    918.35/1,370.05 = 755.54/x
  3. Step 3: Cross multiply
    918.35x = 1,370.05 × 755.54
  4. Step 4: Simplify right side
    918.35x = 1,035,123.80
  5. Step 5: Solve for x
    x = 1,035,123.80/918.35
  6. Step 6: Final answer
    x = 1,127.16

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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.