Home / 128,538.19-192,816.47-39,780.28

Finding the Fourth Proportional to 128,538.19, 192,816.47 and 39,780.28

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Solution

The fourth proportional to 128,538.19, 192,816.47 and 39,780.28 is: 59,673.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,538.19 : 192,816.47 = 39,780.28 : x
  2. Step 2: Convert to fraction form
    128,538.19/192,816.47 = 39,780.28/x
  3. Step 3: Cross multiply
    128,538.19x = 192,816.47 × 39,780.28
  4. Step 4: Simplify right side
    128,538.19x = 7,670,293,165.21
  5. Step 5: Solve for x
    x = 7,670,293,165.21/128,538.19
  6. Step 6: Final answer
    x = 59,673.26

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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.