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Finding the Fourth Proportional to 15,119.92, 20,864.98 and 8,405.40

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Solution

The fourth proportional to 15,119.92, 20,864.98 and 8,405.40 is: 11,599.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,119.92 : 20,864.98 = 8,405.40 : x
  2. Step 2: Convert to fraction form
    15,119.92/20,864.98 = 8,405.40/x
  3. Step 3: Cross multiply
    15,119.92x = 20,864.98 × 8,405.40
  4. Step 4: Simplify right side
    15,119.92x = 175,378,502.89
  5. Step 5: Solve for x
    x = 175,378,502.89/15,119.92
  6. Step 6: Final answer
    x = 11,599.17

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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.