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Finding the Fourth Proportional to 105,775.47, 145,991.63 and 71,794.91

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Solution

The fourth proportional to 105,775.47, 145,991.63 and 71,794.91 is: 99,091.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,775.47 : 145,991.63 = 71,794.91 : x
  2. Step 2: Convert to fraction form
    105,775.47/145,991.63 = 71,794.91/x
  3. Step 3: Cross multiply
    105,775.47x = 145,991.63 × 71,794.91
  4. Step 4: Simplify right side
    105,775.47x = 10,481,455,206.65
  5. Step 5: Solve for x
    x = 10,481,455,206.65/105,775.47
  6. Step 6: Final answer
    x = 99,091.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.