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Finding the Fourth Proportional to 15,372, 21,213.13 and 8,658.28

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Solution

The fourth proportional to 15,372, 21,213.13 and 8,658.28 is: 11,948.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,372 : 21,213.13 = 8,658.28 : x
  2. Step 2: Convert to fraction form
    15,372/21,213.13 = 8,658.28/x
  3. Step 3: Cross multiply
    15,372x = 21,213.13 × 8,658.28
  4. Step 4: Simplify right side
    15,372x = 183,669,219.22
  5. Step 5: Solve for x
    x = 183,669,219.22/15,372
  6. Step 6: Final answer
    x = 11,948.30

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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.