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Finding the Fourth Proportional to 128,693.20, 192,949.80 and 76,075.60

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Solution

The fourth proportional to 128,693.20, 192,949.80 and 76,075.60 is: 114,060.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,693.20 : 192,949.80 = 76,075.60 : x
  2. Step 2: Convert to fraction form
    128,693.20/192,949.80 = 76,075.60/x
  3. Step 3: Cross multiply
    128,693.20x = 192,949.80 × 76,075.60
  4. Step 4: Simplify right side
    128,693.20x = 14,678,771,804.88
  5. Step 5: Solve for x
    x = 14,678,771,804.88/128,693.20
  6. Step 6: Final answer
    x = 114,060.20

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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.