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Finding the Fourth Proportional to 128,609.46, 177,488.43 and 72,020.34

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Solution

The fourth proportional to 128,609.46, 177,488.43 and 72,020.34 is: 99,392.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.46 : 177,488.43 = 72,020.34 : x
  2. Step 2: Convert to fraction form
    128,609.46/177,488.43 = 72,020.34/x
  3. Step 3: Cross multiply
    128,609.46x = 177,488.43 × 72,020.34
  4. Step 4: Simplify right side
    128,609.46x = 12,782,777,074.67
  5. Step 5: Solve for x
    x = 12,782,777,074.67/128,609.46
  6. Step 6: Final answer
    x = 99,392.20

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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.