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Finding the Fourth Proportional to 30,419.51, 41,978.47 and 16,990.95

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Solution

The fourth proportional to 30,419.51, 41,978.47 and 16,990.95 is: 23,447.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,419.51 : 41,978.47 = 16,990.95 : x
  2. Step 2: Convert to fraction form
    30,419.51/41,978.47 = 16,990.95/x
  3. Step 3: Cross multiply
    30,419.51x = 41,978.47 × 16,990.95
  4. Step 4: Simplify right side
    30,419.51x = 713,254,084.85
  5. Step 5: Solve for x
    x = 713,254,084.85/30,419.51
  6. Step 6: Final answer
    x = 23,447.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.