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Finding the Fourth Proportional to 128,448.61, 192,451.41 and 85,145.00

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Solution

The fourth proportional to 128,448.61, 192,451.41 and 85,145.00 is: 127,570.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,448.61 : 192,451.41 = 85,145.00 : x
  2. Step 2: Convert to fraction form
    128,448.61/192,451.41 = 85,145.00/x
  3. Step 3: Cross multiply
    128,448.61x = 192,451.41 × 85,145.00
  4. Step 4: Simplify right side
    128,448.61x = 16,386,274,342.19
  5. Step 5: Solve for x
    x = 16,386,274,342.19/128,448.61
  6. Step 6: Final answer
    x = 127,570.67

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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.