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Finding the Fourth Proportional to 128,020.40, 192,030.60 and 65,812.40

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Solution

The fourth proportional to 128,020.40, 192,030.60 and 65,812.40 is: 98,718.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.40 : 192,030.60 = 65,812.40 : x
  2. Step 2: Convert to fraction form
    128,020.40/192,030.60 = 65,812.40/x
  3. Step 3: Cross multiply
    128,020.40x = 192,030.60 × 65,812.40
  4. Step 4: Simplify right side
    128,020.40x = 12,637,994,659.44
  5. Step 5: Solve for x
    x = 12,637,994,659.44/128,020.40
  6. Step 6: Final answer
    x = 98,718.60

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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.