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Finding the Fourth Proportional to 128,613.96, 177,486.48 and 72,025.20

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Solution

The fourth proportional to 128,613.96, 177,486.48 and 72,025.20 is: 99,394.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,613.96 : 177,486.48 = 72,025.20 : x
  2. Step 2: Convert to fraction form
    128,613.96/177,486.48 = 72,025.20/x
  3. Step 3: Cross multiply
    128,613.96x = 177,486.48 × 72,025.20
  4. Step 4: Simplify right side
    128,613.96x = 12,783,499,219.30
  5. Step 5: Solve for x
    x = 12,783,499,219.30/128,613.96
  6. Step 6: Final answer
    x = 99,394.34

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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.