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Finding the Fourth Proportional to 128,708.64, 177,624.96 and 72,138.24

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Solution

The fourth proportional to 128,708.64, 177,624.96 and 72,138.24 is: 99,554.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,708.64 : 177,624.96 = 72,138.24 : x
  2. Step 2: Convert to fraction form
    128,708.64/177,624.96 = 72,138.24/x
  3. Step 3: Cross multiply
    128,708.64x = 177,624.96 × 72,138.24
  4. Step 4: Simplify right side
    128,708.64x = 12,813,551,994.47
  5. Step 5: Solve for x
    x = 12,813,551,994.47/128,708.64
  6. Step 6: Final answer
    x = 99,554.72

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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.