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Finding the Fourth Proportional to 15,321, 21,143.04 and 8,606.40

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Solution

The fourth proportional to 15,321, 21,143.04 and 8,606.40 is: 11,876.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321 : 21,143.04 = 8,606.40 : x
  2. Step 2: Convert to fraction form
    15,321/21,143.04 = 8,606.40/x
  3. Step 3: Cross multiply
    15,321x = 21,143.04 × 8,606.40
  4. Step 4: Simplify right side
    15,321x = 181,965,459.46
  5. Step 5: Solve for x
    x = 181,965,459.46/15,321
  6. Step 6: Final answer
    x = 11,876.87

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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.