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Finding the Fourth Proportional to 86,818.80, 130,228.20 and 78,783.60

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Solution

The fourth proportional to 86,818.80, 130,228.20 and 78,783.60 is: 118,175.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,818.80 : 130,228.20 = 78,783.60 : x
  2. Step 2: Convert to fraction form
    86,818.80/130,228.20 = 78,783.60/x
  3. Step 3: Cross multiply
    86,818.80x = 130,228.20 × 78,783.60
  4. Step 4: Simplify right side
    86,818.80x = 10,259,846,417.52
  5. Step 5: Solve for x
    x = 10,259,846,417.52/86,818.80
  6. Step 6: Final answer
    x = 118,175.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.