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Finding the Fourth Proportional to 10,603.90, 15,900.79 and 3,938.28

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Solution

The fourth proportional to 10,603.90, 15,900.79 and 3,938.28 is: 5,905.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,603.90 : 15,900.79 = 3,938.28 : x
  2. Step 2: Convert to fraction form
    10,603.90/15,900.79 = 3,938.28/x
  3. Step 3: Cross multiply
    10,603.90x = 15,900.79 × 3,938.28
  4. Step 4: Simplify right side
    10,603.90x = 62,621,763.24
  5. Step 5: Solve for x
    x = 62,621,763.24/10,603.90
  6. Step 6: Final answer
    x = 5,905.54

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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.