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Finding the Fourth Proportional to 12,603.78, 18,903.14 and 11,979.30

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Solution

The fourth proportional to 12,603.78, 18,903.14 and 11,979.30 is: 17,966.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,603.78 : 18,903.14 = 11,979.30 : x
  2. Step 2: Convert to fraction form
    12,603.78/18,903.14 = 11,979.30/x
  3. Step 3: Cross multiply
    12,603.78x = 18,903.14 × 11,979.30
  4. Step 4: Simplify right side
    12,603.78x = 226,446,385.00
  5. Step 5: Solve for x
    x = 226,446,385.00/12,603.78
  6. Step 6: Final answer
    x = 17,966.55

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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.