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Finding the Fourth Proportional to 128,847.50, 177,828.99 and 78,575.66

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Solution

The fourth proportional to 128,847.50, 177,828.99 and 78,575.66 is: 108,446.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,847.50 : 177,828.99 = 78,575.66 : x
  2. Step 2: Convert to fraction form
    128,847.50/177,828.99 = 78,575.66/x
  3. Step 3: Cross multiply
    128,847.50x = 177,828.99 × 78,575.66
  4. Step 4: Simplify right side
    128,847.50x = 13,973,030,256.38
  5. Step 5: Solve for x
    x = 13,973,030,256.38/128,847.50
  6. Step 6: Final answer
    x = 108,446.27

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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.