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Finding the Fourth Proportional to 42,603.43, 63,902.81 and 13,021.25

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Solution

The fourth proportional to 42,603.43, 63,902.81 and 13,021.25 is: 19,531.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,603.43 : 63,902.81 = 13,021.25 : x
  2. Step 2: Convert to fraction form
    42,603.43/63,902.81 = 13,021.25/x
  3. Step 3: Cross multiply
    42,603.43x = 63,902.81 × 13,021.25
  4. Step 4: Simplify right side
    42,603.43x = 832,094,080.09
  5. Step 5: Solve for x
    x = 832,094,080.09/42,603.43
  6. Step 6: Final answer
    x = 19,531.15

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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.