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Finding the Fourth Proportional to 128,485.80, 192,448.02 and 53,378.22

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Solution

The fourth proportional to 128,485.80, 192,448.02 and 53,378.22 is: 79,950.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,485.80 : 192,448.02 = 53,378.22 : x
  2. Step 2: Convert to fraction form
    128,485.80/192,448.02 = 53,378.22/x
  3. Step 3: Cross multiply
    128,485.80x = 192,448.02 × 53,378.22
  4. Step 4: Simplify right side
    128,485.80x = 10,272,532,750.12
  5. Step 5: Solve for x
    x = 10,272,532,750.12/128,485.80
  6. Step 6: Final answer
    x = 79,950.72

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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.