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Finding the Fourth Proportional to 128,508.06, 192,780.51 and 39,768.51

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Solution

The fourth proportional to 128,508.06, 192,780.51 and 39,768.51 is: 59,658.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,508.06 : 192,780.51 = 39,768.51 : x
  2. Step 2: Convert to fraction form
    128,508.06/192,780.51 = 39,768.51/x
  3. Step 3: Cross multiply
    128,508.06x = 192,780.51 × 39,768.51
  4. Step 4: Simplify right side
    128,508.06x = 7,666,593,639.74
  5. Step 5: Solve for x
    x = 7,666,593,639.74/128,508.06
  6. Step 6: Final answer
    x = 59,658.47

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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.