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Finding the Fourth Proportional to 128,880, 177,885.12 and 78,621.12

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Solution

The fourth proportional to 128,880, 177,885.12 and 78,621.12 is: 108,515.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,880 : 177,885.12 = 78,621.12 : x
  2. Step 2: Convert to fraction form
    128,880/177,885.12 = 78,621.12/x
  3. Step 3: Cross multiply
    128,880x = 177,885.12 × 78,621.12
  4. Step 4: Simplify right side
    128,880x = 13,985,527,365.73
  5. Step 5: Solve for x
    x = 13,985,527,365.73/128,880
  6. Step 6: Final answer
    x = 108,515.89

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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.