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Finding the Fourth Proportional to 15,695.49, 21,659.93 and 8,621.91

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Solution

The fourth proportional to 15,695.49, 21,659.93 and 8,621.91 is: 11,898.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,695.49 : 21,659.93 = 8,621.91 : x
  2. Step 2: Convert to fraction form
    15,695.49/21,659.93 = 8,621.91/x
  3. Step 3: Cross multiply
    15,695.49x = 21,659.93 × 8,621.91
  4. Step 4: Simplify right side
    15,695.49x = 186,749,956.29
  5. Step 5: Solve for x
    x = 186,749,956.29/15,695.49
  6. Step 6: Final answer
    x = 11,898.32

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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.