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Finding the Fourth Proportional to 15,695.13, 21,658.47 and 8,620.20

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Solution

The fourth proportional to 15,695.13, 21,658.47 and 8,620.20 is: 11,895.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,695.13 : 21,658.47 = 8,620.20 : x
  2. Step 2: Convert to fraction form
    15,695.13/21,658.47 = 8,620.20/x
  3. Step 3: Cross multiply
    15,695.13x = 21,658.47 × 8,620.20
  4. Step 4: Simplify right side
    15,695.13x = 186,700,343.09
  5. Step 5: Solve for x
    x = 186,700,343.09/15,695.13
  6. Step 6: Final answer
    x = 11,895.43

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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.