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Finding the Fourth Proportional to 28,596.89, 42,895.95 and 20,128.79

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Solution

The fourth proportional to 28,596.89, 42,895.95 and 20,128.79 is: 30,193.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,596.89 : 42,895.95 = 20,128.79 : x
  2. Step 2: Convert to fraction form
    28,596.89/42,895.95 = 20,128.79/x
  3. Step 3: Cross multiply
    28,596.89x = 42,895.95 × 20,128.79
  4. Step 4: Simplify right side
    28,596.89x = 863,443,354.92
  5. Step 5: Solve for x
    x = 863,443,354.92/28,596.89
  6. Step 6: Final answer
    x = 30,193.62

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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.