Home / 86,715.20-129,986.40-39,886.40

Finding the Fourth Proportional to 86,715.20, 129,986.40 and 39,886.40

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Solution

The fourth proportional to 86,715.20, 129,986.40 and 39,886.40 is: 59,789.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,715.20 : 129,986.40 = 39,886.40 : x
  2. Step 2: Convert to fraction form
    86,715.20/129,986.40 = 39,886.40/x
  3. Step 3: Cross multiply
    86,715.20x = 129,986.40 × 39,886.40
  4. Step 4: Simplify right side
    86,715.20x = 5,184,689,544.96
  5. Step 5: Solve for x
    x = 5,184,689,544.96/86,715.20
  6. Step 6: Final answer
    x = 59,789.86

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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.