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Finding the Fourth Proportional to 918.23, 1,374.14 and 751.78

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Solution

The fourth proportional to 918.23, 1,374.14 and 751.78 is: 1,125.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.23 : 1,374.14 = 751.78 : x
  2. Step 2: Convert to fraction form
    918.23/1,374.14 = 751.78/x
  3. Step 3: Cross multiply
    918.23x = 1,374.14 × 751.78
  4. Step 4: Simplify right side
    918.23x = 1,033,040.34
  5. Step 5: Solve for x
    x = 1,033,040.34/918.23
  6. Step 6: Final answer
    x = 1,125.03

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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.