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Finding the Fourth Proportional to 128,768.77, 193,208.65 and 69,646.06

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Solution

The fourth proportional to 128,768.77, 193,208.65 and 69,646.06 is: 104,499.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,768.77 : 193,208.65 = 69,646.06 : x
  2. Step 2: Convert to fraction form
    128,768.77/193,208.65 = 69,646.06/x
  3. Step 3: Cross multiply
    128,768.77x = 193,208.65 × 69,646.06
  4. Step 4: Simplify right side
    128,768.77x = 13,456,220,834.45
  5. Step 5: Solve for x
    x = 13,456,220,834.45/128,768.77
  6. Step 6: Final answer
    x = 104,499.10

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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.