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Finding the Fourth Proportional to 42,603.69, 63,905.54 and 13,021.28

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Solution

The fourth proportional to 42,603.69, 63,905.54 and 13,021.28 is: 19,531.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,603.69 : 63,905.54 = 13,021.28 : x
  2. Step 2: Convert to fraction form
    42,603.69/63,905.54 = 13,021.28/x
  3. Step 3: Cross multiply
    42,603.69x = 63,905.54 × 13,021.28
  4. Step 4: Simplify right side
    42,603.69x = 832,131,882.56
  5. Step 5: Solve for x
    x = 832,131,882.56/42,603.69
  6. Step 6: Final answer
    x = 19,531.92

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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.