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Finding the Fourth Proportional to 28,420.46, 42,636.94 and 8,700.54

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Solution

The fourth proportional to 28,420.46, 42,636.94 and 8,700.54 is: 13,052.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.46 : 42,636.94 = 8,700.54 : x
  2. Step 2: Convert to fraction form
    28,420.46/42,636.94 = 8,700.54/x
  3. Step 3: Cross multiply
    28,420.46x = 42,636.94 × 8,700.54
  4. Step 4: Simplify right side
    28,420.46x = 370,964,401.95
  5. Step 5: Solve for x
    x = 370,964,401.95/28,420.46
  6. Step 6: Final answer
    x = 13,052.72

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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.