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Finding the Fourth Proportional to 20,457.92, 30,686.88 and 8,770.16

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Solution

The fourth proportional to 20,457.92, 30,686.88 and 8,770.16 is: 13,155.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,457.92 : 30,686.88 = 8,770.16 : x
  2. Step 2: Convert to fraction form
    20,457.92/30,686.88 = 8,770.16/x
  3. Step 3: Cross multiply
    20,457.92x = 30,686.88 × 8,770.16
  4. Step 4: Simplify right side
    20,457.92x = 269,128,847.50
  5. Step 5: Solve for x
    x = 269,128,847.50/20,457.92
  6. Step 6: Final answer
    x = 13,155.24

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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.