Home / 86,311.20-129,466.80-51,290.40

Finding the Fourth Proportional to 86,311.20, 129,466.80 and 51,290.40

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Solution

The fourth proportional to 86,311.20, 129,466.80 and 51,290.40 is: 76,935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,311.20 : 129,466.80 = 51,290.40 : x
  2. Step 2: Convert to fraction form
    86,311.20/129,466.80 = 51,290.40/x
  3. Step 3: Cross multiply
    86,311.20x = 129,466.80 × 51,290.40
  4. Step 4: Simplify right side
    86,311.20x = 6,640,403,958.72
  5. Step 5: Solve for x
    x = 6,640,403,958.72/86,311.20
  6. Step 6: Final answer
    x = 76,935.60

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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.