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Finding the Fourth Proportional to 30,611.25, 45,916.88 and 12,143.25

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Solution

The fourth proportional to 30,611.25, 45,916.88 and 12,143.25 is: 18,214.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,611.25 : 45,916.88 = 12,143.25 : x
  2. Step 2: Convert to fraction form
    30,611.25/45,916.88 = 12,143.25/x
  3. Step 3: Cross multiply
    30,611.25x = 45,916.88 × 12,143.25
  4. Step 4: Simplify right side
    30,611.25x = 557,580,092.34
  5. Step 5: Solve for x
    x = 557,580,092.34/30,611.25
  6. Step 6: Final answer
    x = 18,214.88

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1.5x scale

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.