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Finding the Fourth Proportional to 918.61, 1,376.83 and 754.25

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Solution

The fourth proportional to 918.61, 1,376.83 and 754.25 is: 1,130.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.61 : 1,376.83 = 754.25 : x
  2. Step 2: Convert to fraction form
    918.61/1,376.83 = 754.25/x
  3. Step 3: Cross multiply
    918.61x = 1,376.83 × 754.25
  4. Step 4: Simplify right side
    918.61x = 1,038,468.09
  5. Step 5: Solve for x
    x = 1,038,468.09/918.61
  6. Step 6: Final answer
    x = 1,130.48

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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.