Home / 115,128.63-172,732.16-70,239.86

Finding the Fourth Proportional to 115,128.63, 172,732.16 and 70,239.86

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Solution

The fourth proportional to 115,128.63, 172,732.16 and 70,239.86 is: 105,383.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,128.63 : 172,732.16 = 70,239.86 : x
  2. Step 2: Convert to fraction form
    115,128.63/172,732.16 = 70,239.86/x
  3. Step 3: Cross multiply
    115,128.63x = 172,732.16 × 70,239.86
  4. Step 4: Simplify right side
    115,128.63x = 12,132,681,784.44
  5. Step 5: Solve for x
    x = 12,132,681,784.44/115,128.63
  6. Step 6: Final answer
    x = 105,383.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.