Home / 128,458.90-177,269.63-71,100.57

Finding the Fourth Proportional to 128,458.90, 177,269.63 and 71,100.57

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Solution

The fourth proportional to 128,458.90, 177,269.63 and 71,100.57 is: 98,116.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,458.90 : 177,269.63 = 71,100.57 : x
  2. Step 2: Convert to fraction form
    128,458.90/177,269.63 = 71,100.57/x
  3. Step 3: Cross multiply
    128,458.90x = 177,269.63 × 71,100.57
  4. Step 4: Simplify right side
    128,458.90x = 12,603,971,736.69
  5. Step 5: Solve for x
    x = 12,603,971,736.69/128,458.90
  6. Step 6: Final answer
    x = 98,116.77

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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.