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Finding the Fourth Proportional to 28,388.88, 39,175.20 and 21,679.20

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Solution

The fourth proportional to 28,388.88, 39,175.20 and 21,679.20 is: 29,916.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,388.88 : 39,175.20 = 21,679.20 : x
  2. Step 2: Convert to fraction form
    28,388.88/39,175.20 = 21,679.20/x
  3. Step 3: Cross multiply
    28,388.88x = 39,175.20 × 21,679.20
  4. Step 4: Simplify right side
    28,388.88x = 849,286,995.84
  5. Step 5: Solve for x
    x = 849,286,995.84/28,388.88
  6. Step 6: Final answer
    x = 29,916.19

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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.