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Finding the Fourth Proportional to 128,457.12, 192,714.96 and 69,291.48

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Solution

The fourth proportional to 128,457.12, 192,714.96 and 69,291.48 is: 103,953.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,457.12 : 192,714.96 = 69,291.48 : x
  2. Step 2: Convert to fraction form
    128,457.12/192,714.96 = 69,291.48/x
  3. Step 3: Cross multiply
    128,457.12x = 192,714.96 × 69,291.48
  4. Step 4: Simplify right side
    128,457.12x = 13,353,504,796.54
  5. Step 5: Solve for x
    x = 13,353,504,796.54/128,457.12
  6. Step 6: Final answer
    x = 103,953.01

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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.