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Finding the Fourth Proportional to 2,175.54, 3,000.99 and 1,388.70

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Solution

The fourth proportional to 2,175.54, 3,000.99 and 1,388.70 is: 1,915.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,175.54 : 3,000.99 = 1,388.70 : x
  2. Step 2: Convert to fraction form
    2,175.54/3,000.99 = 1,388.70/x
  3. Step 3: Cross multiply
    2,175.54x = 3,000.99 × 1,388.70
  4. Step 4: Simplify right side
    2,175.54x = 4,167,474.81
  5. Step 5: Solve for x
    x = 4,167,474.81/2,175.54
  6. Step 6: Final answer
    x = 1,915.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.