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Finding the Fourth Proportional to 28,604.40, 42,955.20 and 21,217.20

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Solution

The fourth proportional to 28,604.40, 42,955.20 and 21,217.20 is: 31,861.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,604.40 : 42,955.20 = 21,217.20 : x
  2. Step 2: Convert to fraction form
    28,604.40/42,955.20 = 21,217.20/x
  3. Step 3: Cross multiply
    28,604.40x = 42,955.20 × 21,217.20
  4. Step 4: Simplify right side
    28,604.40x = 911,389,069.44
  5. Step 5: Solve for x
    x = 911,389,069.44/28,604.40
  6. Step 6: Final answer
    x = 31,861.85

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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.