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Finding the Fourth Proportional to 12,830.90, 18,015.10 and 12,830.90

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Solution

The fourth proportional to 12,830.90, 18,015.10 and 12,830.90 is: 18,015.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,830.90 : 18,015.10 = 12,830.90 : x
  2. Step 2: Convert to fraction form
    12,830.90/18,015.10 = 12,830.90/x
  3. Step 3: Cross multiply
    12,830.90x = 18,015.10 × 12,830.90
  4. Step 4: Simplify right side
    12,830.90x = 231,149,946.59
  5. Step 5: Solve for x
    x = 231,149,946.59/12,830.90
  6. Step 6: Final answer
    x = 18,015.10

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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.