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Finding the Fourth Proportional to 86,620.80, 130,028.40 and 66,986.40

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Solution

The fourth proportional to 86,620.80, 130,028.40 and 66,986.40 is: 100,554.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,620.80 : 130,028.40 = 66,986.40 : x
  2. Step 2: Convert to fraction form
    86,620.80/130,028.40 = 66,986.40/x
  3. Step 3: Cross multiply
    86,620.80x = 130,028.40 × 66,986.40
  4. Step 4: Simplify right side
    86,620.80x = 8,710,134,413.76
  5. Step 5: Solve for x
    x = 8,710,134,413.76/86,620.80
  6. Step 6: Final answer
    x = 100,554.77

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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.