Home / 128,931.22-193,209.90-91,564.48

Finding the Fourth Proportional to 128,931.22, 193,209.90 and 91,564.48

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Solution

The fourth proportional to 128,931.22, 193,209.90 and 91,564.48 is: 137,213.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,931.22 : 193,209.90 = 91,564.48 : x
  2. Step 2: Convert to fraction form
    128,931.22/193,209.90 = 91,564.48/x
  3. Step 3: Cross multiply
    128,931.22x = 193,209.90 × 91,564.48
  4. Step 4: Simplify right side
    128,931.22x = 17,691,164,024.35
  5. Step 5: Solve for x
    x = 17,691,164,024.35/128,931.22
  6. Step 6: Final answer
    x = 137,213.97

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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.