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Finding the Fourth Proportional to 2,012, 3,018.80 and 916.88

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Solution

The fourth proportional to 2,012, 3,018.80 and 916.88 is: 1,375.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,012 : 3,018.80 = 916.88 : x
  2. Step 2: Convert to fraction form
    2,012/3,018.80 = 916.88/x
  3. Step 3: Cross multiply
    2,012x = 3,018.80 × 916.88
  4. Step 4: Simplify right side
    2,012x = 2,767,877.34
  5. Step 5: Solve for x
    x = 2,767,877.34/2,012
  6. Step 6: Final answer
    x = 1,375.68

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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.