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Finding the Fourth Proportional to 18,881.40, 28,322.10 and 12,271.80

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Solution

The fourth proportional to 18,881.40, 28,322.10 and 12,271.80 is: 18,407.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,881.40 : 28,322.10 = 12,271.80 : x
  2. Step 2: Convert to fraction form
    18,881.40/28,322.10 = 12,271.80/x
  3. Step 3: Cross multiply
    18,881.40x = 28,322.10 × 12,271.80
  4. Step 4: Simplify right side
    18,881.40x = 347,563,146.78
  5. Step 5: Solve for x
    x = 347,563,146.78/18,881.40
  6. Step 6: Final answer
    x = 18,407.70

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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.