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Finding the Fourth Proportional to 12,981.70, 18,135.50 and 12,981.70

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Solution

The fourth proportional to 12,981.70, 18,135.50 and 12,981.70 is: 18,135.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,981.70 : 18,135.50 = 12,981.70 : x
  2. Step 2: Convert to fraction form
    12,981.70/18,135.50 = 12,981.70/x
  3. Step 3: Cross multiply
    12,981.70x = 18,135.50 × 12,981.70
  4. Step 4: Simplify right side
    12,981.70x = 235,429,620.35
  5. Step 5: Solve for x
    x = 235,429,620.35/12,981.70
  6. Step 6: Final answer
    x = 18,135.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.