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Finding the Fourth Proportional to 12,603.79, 18,905.68 and 5,200.11

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Solution

The fourth proportional to 12,603.79, 18,905.68 and 5,200.11 is: 7,800.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,603.79 : 18,905.68 = 5,200.11 : x
  2. Step 2: Convert to fraction form
    12,603.79/18,905.68 = 5,200.11/x
  3. Step 3: Cross multiply
    12,603.79x = 18,905.68 × 5,200.11
  4. Step 4: Simplify right side
    12,603.79x = 98,311,622.12
  5. Step 5: Solve for x
    x = 98,311,622.12/12,603.79
  6. Step 6: Final answer
    x = 7,800.17

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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.