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Finding the Fourth Proportional to 128,920.14, 177,906.36 and 71,559.30

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Solution

The fourth proportional to 128,920.14, 177,906.36 and 71,559.30 is: 98,749.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,920.14 : 177,906.36 = 71,559.30 : x
  2. Step 2: Convert to fraction form
    128,920.14/177,906.36 = 71,559.30/x
  3. Step 3: Cross multiply
    128,920.14x = 177,906.36 × 71,559.30
  4. Step 4: Simplify right side
    128,920.14x = 12,730,854,587.15
  5. Step 5: Solve for x
    x = 12,730,854,587.15/128,920.14
  6. Step 6: Final answer
    x = 98,749.93

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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.