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Finding the Fourth Proportional to 28,611.86, 42,916.86 and 8,621.46

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Solution

The fourth proportional to 28,611.86, 42,916.86 and 8,621.46 is: 12,931.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.86 : 42,916.86 = 8,621.46 : x
  2. Step 2: Convert to fraction form
    28,611.86/42,916.86 = 8,621.46/x
  3. Step 3: Cross multiply
    28,611.86x = 42,916.86 × 8,621.46
  4. Step 4: Simplify right side
    28,611.86x = 370,005,991.82
  5. Step 5: Solve for x
    x = 370,005,991.82/28,611.86
  6. Step 6: Final answer
    x = 12,931.91

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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.