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Finding the Fourth Proportional to 128,620.88, 192,931.40 and 53,700.18

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Solution

The fourth proportional to 128,620.88, 192,931.40 and 53,700.18 is: 80,550.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,620.88 : 192,931.40 = 53,700.18 : x
  2. Step 2: Convert to fraction form
    128,620.88/192,931.40 = 53,700.18/x
  3. Step 3: Cross multiply
    128,620.88x = 192,931.40 × 53,700.18
  4. Step 4: Simplify right side
    128,620.88x = 10,360,450,907.65
  5. Step 5: Solve for x
    x = 10,360,450,907.65/128,620.88
  6. Step 6: Final answer
    x = 80,550.30

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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.