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Finding the Fourth Proportional to 18,971.20, 26,176.80 and 16,314.40

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Solution

The fourth proportional to 18,971.20, 26,176.80 and 16,314.40 is: 22,510.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.20 : 26,176.80 = 16,314.40 : x
  2. Step 2: Convert to fraction form
    18,971.20/26,176.80 = 16,314.40/x
  3. Step 3: Cross multiply
    18,971.20x = 26,176.80 × 16,314.40
  4. Step 4: Simplify right side
    18,971.20x = 427,058,785.92
  5. Step 5: Solve for x
    x = 427,058,785.92/18,971.20
  6. Step 6: Final answer
    x = 22,510.90

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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.