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Finding the Fourth Proportional to 128,609.64, 177,485.22 and 72,023.40

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Solution

The fourth proportional to 128,609.64, 177,485.22 and 72,023.40 is: 99,394.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.64 : 177,485.22 = 72,023.40 : x
  2. Step 2: Convert to fraction form
    128,609.64/177,485.22 = 72,023.40/x
  3. Step 3: Cross multiply
    128,609.64x = 177,485.22 × 72,023.40
  4. Step 4: Simplify right side
    128,609.64x = 12,783,088,994.15
  5. Step 5: Solve for x
    x = 12,783,088,994.15/128,609.64
  6. Step 6: Final answer
    x = 99,394.49

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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.