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Finding the Fourth Proportional to 18,931.61, 28,395.44 and 8,401.81

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Solution

The fourth proportional to 18,931.61, 28,395.44 and 8,401.81 is: 12,601.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,931.61 : 28,395.44 = 8,401.81 : x
  2. Step 2: Convert to fraction form
    18,931.61/28,395.44 = 8,401.81/x
  3. Step 3: Cross multiply
    18,931.61x = 28,395.44 × 8,401.81
  4. Step 4: Simplify right side
    18,931.61x = 238,573,091.75
  5. Step 5: Solve for x
    x = 238,573,091.75/18,931.61
  6. Step 6: Final answer
    x = 12,601.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.