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Finding the Fourth Proportional to 128,493.81, 192,739.59 and 100,437.45

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Solution

The fourth proportional to 128,493.81, 192,739.59 and 100,437.45 is: 150,655.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,493.81 : 192,739.59 = 100,437.45 : x
  2. Step 2: Convert to fraction form
    128,493.81/192,739.59 = 100,437.45/x
  3. Step 3: Cross multiply
    128,493.81x = 192,739.59 × 100,437.45
  4. Step 4: Simplify right side
    128,493.81x = 19,358,272,933.65
  5. Step 5: Solve for x
    x = 19,358,272,933.65/128,493.81
  6. Step 6: Final answer
    x = 150,655.30

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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.