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Finding the Fourth Proportional to 15,119.92, 20,864.55 and 8,405.16

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Solution

The fourth proportional to 15,119.92, 20,864.55 and 8,405.16 is: 11,598.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,119.92 : 20,864.55 = 8,405.16 : x
  2. Step 2: Convert to fraction form
    15,119.92/20,864.55 = 8,405.16/x
  3. Step 3: Cross multiply
    15,119.92x = 20,864.55 × 8,405.16
  4. Step 4: Simplify right side
    15,119.92x = 175,369,881.08
  5. Step 5: Solve for x
    x = 175,369,881.08/15,119.92
  6. Step 6: Final answer
    x = 11,598.60

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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.