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Finding the Fourth Proportional to 128,500.45, 192,639.87 and 61,987.30

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Solution

The fourth proportional to 128,500.45, 192,639.87 and 61,987.30 is: 92,927.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,500.45 : 192,639.87 = 61,987.30 : x
  2. Step 2: Convert to fraction form
    128,500.45/192,639.87 = 61,987.30/x
  3. Step 3: Cross multiply
    128,500.45x = 192,639.87 × 61,987.30
  4. Step 4: Simplify right side
    128,500.45x = 11,941,225,413.65
  5. Step 5: Solve for x
    x = 11,941,225,413.65/128,500.45
  6. Step 6: Final answer
    x = 92,927.50

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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.