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Finding the Fourth Proportional to 128,816.93, 177,761.12 and 71,458.54

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Solution

The fourth proportional to 128,816.93, 177,761.12 and 71,458.54 is: 98,609.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,816.93 : 177,761.12 = 71,458.54 : x
  2. Step 2: Convert to fraction form
    128,816.93/177,761.12 = 71,458.54/x
  3. Step 3: Cross multiply
    128,816.93x = 177,761.12 × 71,458.54
  4. Step 4: Simplify right side
    128,816.93x = 12,702,549,302.27
  5. Step 5: Solve for x
    x = 12,702,549,302.27/128,816.93
  6. Step 6: Final answer
    x = 98,609.31

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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.