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Finding the Fourth Proportional to 916.98, 1,375.65 and 755.34

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Solution

The fourth proportional to 916.98, 1,375.65 and 755.34 is: 1,133.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.98 : 1,375.65 = 755.34 : x
  2. Step 2: Convert to fraction form
    916.98/1,375.65 = 755.34/x
  3. Step 3: Cross multiply
    916.98x = 1,375.65 × 755.34
  4. Step 4: Simplify right side
    916.98x = 1,039,083.47
  5. Step 5: Solve for x
    x = 1,039,083.47/916.98
  6. Step 6: Final answer
    x = 1,133.16

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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.