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Finding the Fourth Proportional to 15,721.24, 21,695.08 and 8,647.24

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Solution

The fourth proportional to 15,721.24, 21,695.08 and 8,647.24 is: 11,933.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.24 : 21,695.08 = 8,647.24 : x
  2. Step 2: Convert to fraction form
    15,721.24/21,695.08 = 8,647.24/x
  3. Step 3: Cross multiply
    15,721.24x = 21,695.08 × 8,647.24
  4. Step 4: Simplify right side
    15,721.24x = 187,602,563.58
  5. Step 5: Solve for x
    x = 187,602,563.58/15,721.24
  6. Step 6: Final answer
    x = 11,933.06

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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.