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Finding the Fourth Proportional to 28,643.61, 42,962.23 and 8,920.52

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Solution

The fourth proportional to 28,643.61, 42,962.23 and 8,920.52 is: 13,379.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,643.61 : 42,962.23 = 8,920.52 : x
  2. Step 2: Convert to fraction form
    28,643.61/42,962.23 = 8,920.52/x
  3. Step 3: Cross multiply
    28,643.61x = 42,962.23 × 8,920.52
  4. Step 4: Simplify right side
    28,643.61x = 383,245,172.55
  5. Step 5: Solve for x
    x = 383,245,172.55/28,643.61
  6. Step 6: Final answer
    x = 13,379.78

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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.