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Finding the Fourth Proportional to 18,840.80, 26,000.82 and 12,139.40

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Solution

The fourth proportional to 18,840.80, 26,000.82 and 12,139.40 is: 16,752.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,840.80 : 26,000.82 = 12,139.40 : x
  2. Step 2: Convert to fraction form
    18,840.80/26,000.82 = 12,139.40/x
  3. Step 3: Cross multiply
    18,840.80x = 26,000.82 × 12,139.40
  4. Step 4: Simplify right side
    18,840.80x = 315,634,354.31
  5. Step 5: Solve for x
    x = 315,634,354.31/18,840.80
  6. Step 6: Final answer
    x = 16,752.70

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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.