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Finding the Fourth Proportional to 121,765.86, 167,928.12 and 76,448.12

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Solution

The fourth proportional to 121,765.86, 167,928.12 and 76,448.12 is: 105,430.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,765.86 : 167,928.12 = 76,448.12 : x
  2. Step 2: Convert to fraction form
    121,765.86/167,928.12 = 76,448.12/x
  3. Step 3: Cross multiply
    121,765.86x = 167,928.12 × 76,448.12
  4. Step 4: Simplify right side
    121,765.86x = 12,837,788,229.49
  5. Step 5: Solve for x
    x = 12,837,788,229.49/121,765.86
  6. Step 6: Final answer
    x = 105,430.11

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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.