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Finding the Fourth Proportional to 12,830.40, 19,180.80 and 12,700.80

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Solution

The fourth proportional to 12,830.40, 19,180.80 and 12,700.80 is: 18,987.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,830.40 : 19,180.80 = 12,700.80 : x
  2. Step 2: Convert to fraction form
    12,830.40/19,180.80 = 12,700.80/x
  3. Step 3: Cross multiply
    12,830.40x = 19,180.80 × 12,700.80
  4. Step 4: Simplify right side
    12,830.40x = 243,611,504.64
  5. Step 5: Solve for x
    x = 243,611,504.64/12,830.40
  6. Step 6: Final answer
    x = 18,987.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.