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Finding the Fourth Proportional to 128,478.93, 177,351.93 and 87,095.42

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Solution

The fourth proportional to 128,478.93, 177,351.93 and 87,095.42 is: 120,226.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,478.93 : 177,351.93 = 87,095.42 : x
  2. Step 2: Convert to fraction form
    128,478.93/177,351.93 = 87,095.42/x
  3. Step 3: Cross multiply
    128,478.93x = 177,351.93 × 87,095.42
  4. Step 4: Simplify right side
    128,478.93x = 15,446,540,609.47
  5. Step 5: Solve for x
    x = 15,446,540,609.47/128,478.93
  6. Step 6: Final answer
    x = 120,226.26

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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.