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Finding the Fourth Proportional to 28,143.40, 42,212.25 and 8,421.94

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Solution

The fourth proportional to 28,143.40, 42,212.25 and 8,421.94 is: 12,632.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,143.40 : 42,212.25 = 8,421.94 : x
  2. Step 2: Convert to fraction form
    28,143.40/42,212.25 = 8,421.94/x
  3. Step 3: Cross multiply
    28,143.40x = 42,212.25 × 8,421.94
  4. Step 4: Simplify right side
    28,143.40x = 355,509,036.77
  5. Step 5: Solve for x
    x = 355,509,036.77/28,143.40
  6. Step 6: Final answer
    x = 12,632.06

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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.