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Finding the Fourth Proportional to 128,295.80, 192,443.70 and 121,038.20

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Solution

The fourth proportional to 128,295.80, 192,443.70 and 121,038.20 is: 181,557.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,295.80 : 192,443.70 = 121,038.20 : x
  2. Step 2: Convert to fraction form
    128,295.80/192,443.70 = 121,038.20/x
  3. Step 3: Cross multiply
    128,295.80x = 192,443.70 × 121,038.20
  4. Step 4: Simplify right side
    128,295.80x = 23,293,039,049.34
  5. Step 5: Solve for x
    x = 23,293,039,049.34/128,295.80
  6. Step 6: Final answer
    x = 181,557.30

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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.