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Finding the Fourth Proportional to 916.88, 1,255.32 and 907.96

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Solution

The fourth proportional to 916.88, 1,255.32 and 907.96 is: 1,243.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.88 : 1,255.32 = 907.96 : x
  2. Step 2: Convert to fraction form
    916.88/1,255.32 = 907.96/x
  3. Step 3: Cross multiply
    916.88x = 1,255.32 × 907.96
  4. Step 4: Simplify right side
    916.88x = 1,139,780.35
  5. Step 5: Solve for x
    x = 1,139,780.35/916.88
  6. Step 6: Final answer
    x = 1,243.11

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.