Home / 100,712.33-138,980.09-55,390.13

Finding the Fourth Proportional to 100,712.33, 138,980.09 and 55,390.13

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Solution

The fourth proportional to 100,712.33, 138,980.09 and 55,390.13 is: 76,436.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,712.33 : 138,980.09 = 55,390.13 : x
  2. Step 2: Convert to fraction form
    100,712.33/138,980.09 = 55,390.13/x
  3. Step 3: Cross multiply
    100,712.33x = 138,980.09 × 55,390.13
  4. Step 4: Simplify right side
    100,712.33x = 7,698,124,975.56
  5. Step 5: Solve for x
    x = 7,698,124,975.56/100,712.33
  6. Step 6: Final answer
    x = 76,436.77

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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.