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Finding the Fourth Proportional to 128,518.92, 192,785.54 and 39,765.49

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Solution

The fourth proportional to 128,518.92, 192,785.54 and 39,765.49 is: 59,650.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,518.92 : 192,785.54 = 39,765.49 : x
  2. Step 2: Convert to fraction form
    128,518.92/192,785.54 = 39,765.49/x
  3. Step 3: Cross multiply
    128,518.92x = 192,785.54 × 39,765.49
  4. Step 4: Simplify right side
    128,518.92x = 7,666,210,782.22
  5. Step 5: Solve for x
    x = 7,666,210,782.22/128,518.92
  6. Step 6: Final answer
    x = 59,650.45

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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.