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Finding the Fourth Proportional to 28,492.80, 42,740.16 and 8,771.20

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Solution

The fourth proportional to 28,492.80, 42,740.16 and 8,771.20 is: 13,157.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,492.80 : 42,740.16 = 8,771.20 : x
  2. Step 2: Convert to fraction form
    28,492.80/42,740.16 = 8,771.20/x
  3. Step 3: Cross multiply
    28,492.80x = 42,740.16 × 8,771.20
  4. Step 4: Simplify right side
    28,492.80x = 374,882,491.39
  5. Step 5: Solve for x
    x = 374,882,491.39/28,492.80
  6. Step 6: Final answer
    x = 13,157.10

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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.