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Finding the Fourth Proportional to 28,611.85, 42,920.54 and 8,885.11

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Solution

The fourth proportional to 28,611.85, 42,920.54 and 8,885.11 is: 13,328.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,611.85 : 42,920.54 = 8,885.11 : x
  2. Step 2: Convert to fraction form
    28,611.85/42,920.54 = 8,885.11/x
  3. Step 3: Cross multiply
    28,611.85x = 42,920.54 × 8,885.11
  4. Step 4: Simplify right side
    28,611.85x = 381,353,719.16
  5. Step 5: Solve for x
    x = 381,353,719.16/28,611.85
  6. Step 6: Final answer
    x = 13,328.52

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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.