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Finding the Fourth Proportional to 128,494.49, 192,751.45 and 39,756.96

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Solution

The fourth proportional to 128,494.49, 192,751.45 and 39,756.96 is: 59,638.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,494.49 : 192,751.45 = 39,756.96 : x
  2. Step 2: Convert to fraction form
    128,494.49/192,751.45 = 39,756.96/x
  3. Step 3: Cross multiply
    128,494.49x = 192,751.45 × 39,756.96
  4. Step 4: Simplify right side
    128,494.49x = 7,663,211,588.20
  5. Step 5: Solve for x
    x = 7,663,211,588.20/128,494.49
  6. Step 6: Final answer
    x = 59,638.45

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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.