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Finding the Fourth Proportional to 2,669.85, 4,005.54 and 915.09

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Solution

The fourth proportional to 2,669.85, 4,005.54 and 915.09 is: 1,372.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,669.85 : 4,005.54 = 915.09 : x
  2. Step 2: Convert to fraction form
    2,669.85/4,005.54 = 915.09/x
  3. Step 3: Cross multiply
    2,669.85x = 4,005.54 × 915.09
  4. Step 4: Simplify right side
    2,669.85x = 3,665,429.60
  5. Step 5: Solve for x
    x = 3,665,429.60/2,669.85
  6. Step 6: Final answer
    x = 1,372.90

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1.5x scale

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.