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Finding the Fourth Proportional to 128,405.80, 177,200.40 and 71,813.50

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Solution

The fourth proportional to 128,405.80, 177,200.40 and 71,813.50 is: 99,102.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,405.80 : 177,200.40 = 71,813.50 : x
  2. Step 2: Convert to fraction form
    128,405.80/177,200.40 = 71,813.50/x
  3. Step 3: Cross multiply
    128,405.80x = 177,200.40 × 71,813.50
  4. Step 4: Simplify right side
    128,405.80x = 12,725,380,925.40
  5. Step 5: Solve for x
    x = 12,725,380,925.40/128,405.80
  6. Step 6: Final answer
    x = 99,102.85

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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.