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Finding the Fourth Proportional to 128,477.67, 177,287.25 and 76,784.55

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Solution

The fourth proportional to 128,477.67, 177,287.25 and 76,784.55 is: 105,955.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,477.67 : 177,287.25 = 76,784.55 : x
  2. Step 2: Convert to fraction form
    128,477.67/177,287.25 = 76,784.55/x
  3. Step 3: Cross multiply
    128,477.67x = 177,287.25 × 76,784.55
  4. Step 4: Simplify right side
    128,477.67x = 13,612,921,711.99
  5. Step 5: Solve for x
    x = 13,612,921,711.99/128,477.67
  6. Step 6: Final answer
    x = 105,955.55

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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.