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Finding the Fourth Proportional to 128,522.80, 192,784.20 and 86,532.40

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Solution

The fourth proportional to 128,522.80, 192,784.20 and 86,532.40 is: 129,798.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,522.80 : 192,784.20 = 86,532.40 : x
  2. Step 2: Convert to fraction form
    128,522.80/192,784.20 = 86,532.40/x
  3. Step 3: Cross multiply
    128,522.80x = 192,784.20 × 86,532.40
  4. Step 4: Simplify right side
    128,522.80x = 16,682,079,508.08
  5. Step 5: Solve for x
    x = 16,682,079,508.08/128,522.80
  6. Step 6: Final answer
    x = 129,798.60

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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.