Home / 90,708.12-125,133.66-78,111

Finding the Fourth Proportional to 90,708.12, 125,133.66 and 78,111

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Solution

The fourth proportional to 90,708.12, 125,133.66 and 78,111 is: 107,755.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,708.12 : 125,133.66 = 78,111 : x
  2. Step 2: Convert to fraction form
    90,708.12/125,133.66 = 78,111/x
  3. Step 3: Cross multiply
    90,708.12x = 125,133.66 × 78,111
  4. Step 4: Simplify right side
    90,708.12x = 9,774,315,316.26
  5. Step 5: Solve for x
    x = 9,774,315,316.26/90,708.12
  6. Step 6: Final answer
    x = 107,755.68

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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.