Home / 115,430.25-159,360-87,990.96

Finding the Fourth Proportional to 115,430.25, 159,360 and 87,990.96

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Solution

The fourth proportional to 115,430.25, 159,360 and 87,990.96 is: 121,478.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,430.25 : 159,360 = 87,990.96 : x
  2. Step 2: Convert to fraction form
    115,430.25/159,360 = 87,990.96/x
  3. Step 3: Cross multiply
    115,430.25x = 159,360 × 87,990.96
  4. Step 4: Simplify right side
    115,430.25x = 14,022,239,385.60
  5. Step 5: Solve for x
    x = 14,022,239,385.60/115,430.25
  6. Step 6: Final answer
    x = 121,478.03

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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.