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Finding the Fourth Proportional to 128,554.59, 177,405.34 and 78,253.59

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Solution

The fourth proportional to 128,554.59, 177,405.34 and 78,253.59 is: 107,989.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,554.59 : 177,405.34 = 78,253.59 : x
  2. Step 2: Convert to fraction form
    128,554.59/177,405.34 = 78,253.59/x
  3. Step 3: Cross multiply
    128,554.59x = 177,405.34 × 78,253.59
  4. Step 4: Simplify right side
    128,554.59x = 13,882,605,356.53
  5. Step 5: Solve for x
    x = 13,882,605,356.53/128,554.59
  6. Step 6: Final answer
    x = 107,989.96

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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.