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Finding the Fourth Proportional to 12,698.78, 19,036.80 and 4,905.80

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Solution

The fourth proportional to 12,698.78, 19,036.80 and 4,905.80 is: 7,354.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,698.78 : 19,036.80 = 4,905.80 : x
  2. Step 2: Convert to fraction form
    12,698.78/19,036.80 = 4,905.80/x
  3. Step 3: Cross multiply
    12,698.78x = 19,036.80 × 4,905.80
  4. Step 4: Simplify right side
    12,698.78x = 93,390,733.44
  5. Step 5: Solve for x
    x = 93,390,733.44/12,698.78
  6. Step 6: Final answer
    x = 7,354.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.