Home / 115,128.96-158,880-64,828.80

Finding the Fourth Proportional to 115,128.96, 158,880 and 64,828.80

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Solution

The fourth proportional to 115,128.96, 158,880 and 64,828.80 is: 89,464.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,128.96 : 158,880 = 64,828.80 : x
  2. Step 2: Convert to fraction form
    115,128.96/158,880 = 64,828.80/x
  3. Step 3: Cross multiply
    115,128.96x = 158,880 × 64,828.80
  4. Step 4: Simplify right side
    115,128.96x = 10,299,999,744
  5. Step 5: Solve for x
    x = 10,299,999,744/115,128.96
  6. Step 6: Final answer
    x = 89,464.89

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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.