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Finding the Fourth Proportional to 28,154.93, 42,219.93 and 8,429.81

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Solution

The fourth proportional to 28,154.93, 42,219.93 and 8,429.81 is: 12,640.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,154.93 : 42,219.93 = 8,429.81 : x
  2. Step 2: Convert to fraction form
    28,154.93/42,219.93 = 8,429.81/x
  3. Step 3: Cross multiply
    28,154.93x = 42,219.93 × 8,429.81
  4. Step 4: Simplify right side
    28,154.93x = 355,905,808.63
  5. Step 5: Solve for x
    x = 355,905,808.63/28,154.93
  6. Step 6: Final answer
    x = 12,640.98

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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.