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Finding the Fourth Proportional to 128,311.64, 177,062.88 and 70,947.64

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Solution

The fourth proportional to 128,311.64, 177,062.88 and 70,947.64 is: 97,903.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,311.64 : 177,062.88 = 70,947.64 : x
  2. Step 2: Convert to fraction form
    128,311.64/177,062.88 = 70,947.64/x
  3. Step 3: Cross multiply
    128,311.64x = 177,062.88 × 70,947.64
  4. Step 4: Simplify right side
    128,311.64x = 12,562,193,467.60
  5. Step 5: Solve for x
    x = 12,562,193,467.60/128,311.64
  6. Step 6: Final answer
    x = 97,903.77

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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.