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Finding the Fourth Proportional to 30,428.88, 41,990.40 and 16,999.92

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Solution

The fourth proportional to 30,428.88, 41,990.40 and 16,999.92 is: 23,459.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,428.88 : 41,990.40 = 16,999.92 : x
  2. Step 2: Convert to fraction form
    30,428.88/41,990.40 = 16,999.92/x
  3. Step 3: Cross multiply
    30,428.88x = 41,990.40 × 16,999.92
  4. Step 4: Simplify right side
    30,428.88x = 713,833,440.77
  5. Step 5: Solve for x
    x = 713,833,440.77/30,428.88
  6. Step 6: Final answer
    x = 23,459.08

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1.5x scale

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.