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Finding the Fourth Proportional to 128,015.80, 192,081.30 and 61,430.20

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Solution

The fourth proportional to 128,015.80, 192,081.30 and 61,430.20 is: 92,172.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,015.80 : 192,081.30 = 61,430.20 : x
  2. Step 2: Convert to fraction form
    128,015.80/192,081.30 = 61,430.20/x
  3. Step 3: Cross multiply
    128,015.80x = 192,081.30 × 61,430.20
  4. Step 4: Simplify right side
    128,015.80x = 11,799,592,675.26
  5. Step 5: Solve for x
    x = 11,799,592,675.26/128,015.80
  6. Step 6: Final answer
    x = 92,172.94

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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.