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Finding the Fourth Proportional to 128,430.80, 192,401.40 and 69,246.80

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Solution

The fourth proportional to 128,430.80, 192,401.40 and 69,246.80 is: 103,738.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,430.80 : 192,401.40 = 69,246.80 : x
  2. Step 2: Convert to fraction form
    128,430.80/192,401.40 = 69,246.80/x
  3. Step 3: Cross multiply
    128,430.80x = 192,401.40 × 69,246.80
  4. Step 4: Simplify right side
    128,430.80x = 13,323,181,265.52
  5. Step 5: Solve for x
    x = 13,323,181,265.52/128,430.80
  6. Step 6: Final answer
    x = 103,738.21

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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.