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Finding the Fourth Proportional to 28,980.43, 39,990.80 and 17,648.67

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Solution

The fourth proportional to 28,980.43, 39,990.80 and 17,648.67 is: 24,353.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,980.43 : 39,990.80 = 17,648.67 : x
  2. Step 2: Convert to fraction form
    28,980.43/39,990.80 = 17,648.67/x
  3. Step 3: Cross multiply
    28,980.43x = 39,990.80 × 17,648.67
  4. Step 4: Simplify right side
    28,980.43x = 705,784,432.24
  5. Step 5: Solve for x
    x = 705,784,432.24/28,980.43
  6. Step 6: Final answer
    x = 24,353.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.