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Finding the Fourth Proportional to 128,920.60, 177,907.66 and 71,556.58

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Solution

The fourth proportional to 128,920.60, 177,907.66 and 71,556.58 is: 98,746.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,920.60 : 177,907.66 = 71,556.58 : x
  2. Step 2: Convert to fraction form
    128,920.60/177,907.66 = 71,556.58/x
  3. Step 3: Cross multiply
    128,920.60x = 177,907.66 × 71,556.58
  4. Step 4: Simplify right side
    128,920.60x = 12,730,463,705.40
  5. Step 5: Solve for x
    x = 12,730,463,705.40/128,920.60
  6. Step 6: Final answer
    x = 98,746.54

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1.5x scale

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.