Home / 100,606.06-138,838.67-55,281.21

Finding the Fourth Proportional to 100,606.06, 138,838.67 and 55,281.21

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Solution

The fourth proportional to 100,606.06, 138,838.67 and 55,281.21 is: 76,289.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,606.06 : 138,838.67 = 55,281.21 : x
  2. Step 2: Convert to fraction form
    100,606.06/138,838.67 = 55,281.21/x
  3. Step 3: Cross multiply
    100,606.06x = 138,838.67 × 55,281.21
  4. Step 4: Simplify right side
    100,606.06x = 7,675,169,672.39
  5. Step 5: Solve for x
    x = 7,675,169,672.39/100,606.06
  6. Step 6: Final answer
    x = 76,289.34

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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.