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Finding the Fourth Proportional to 121,131.89, 181,497.88 and 70,388.46

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Solution

The fourth proportional to 121,131.89, 181,497.88 and 70,388.46 is: 105,466.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,131.89 : 181,497.88 = 70,388.46 : x
  2. Step 2: Convert to fraction form
    121,131.89/181,497.88 = 70,388.46/x
  3. Step 3: Cross multiply
    121,131.89x = 181,497.88 × 70,388.46
  4. Step 4: Simplify right side
    121,131.89x = 12,775,355,914.52
  5. Step 5: Solve for x
    x = 12,775,355,914.52/121,131.89
  6. Step 6: Final answer
    x = 105,466.50

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1.5x scale

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.