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Finding the Fourth Proportional to 126,978.48, 175,231.08 and 70,390.80

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Solution

The fourth proportional to 126,978.48, 175,231.08 and 70,390.80 is: 97,139.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,978.48 : 175,231.08 = 70,390.80 : x
  2. Step 2: Convert to fraction form
    126,978.48/175,231.08 = 70,390.80/x
  3. Step 3: Cross multiply
    126,978.48x = 175,231.08 × 70,390.80
  4. Step 4: Simplify right side
    126,978.48x = 12,334,655,906.06
  5. Step 5: Solve for x
    x = 12,334,655,906.06/126,978.48
  6. Step 6: Final answer
    x = 97,139.74

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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.