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Finding the Fourth Proportional to 12,765.78, 19,160.78 and 7,845.03

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Solution

The fourth proportional to 12,765.78, 19,160.78 and 7,845.03 is: 11,774.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,765.78 : 19,160.78 = 7,845.03 : x
  2. Step 2: Convert to fraction form
    12,765.78/19,160.78 = 7,845.03/x
  3. Step 3: Cross multiply
    12,765.78x = 19,160.78 × 7,845.03
  4. Step 4: Simplify right side
    12,765.78x = 150,316,854.70
  5. Step 5: Solve for x
    x = 150,316,854.70/12,765.78
  6. Step 6: Final answer
    x = 11,774.98

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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.