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Finding the Fourth Proportional to 128,804, 177,715.88 and 74,342.84

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Solution

The fourth proportional to 128,804, 177,715.88 and 74,342.84 is: 102,573.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,804 : 177,715.88 = 74,342.84 : x
  2. Step 2: Convert to fraction form
    128,804/177,715.88 = 74,342.84/x
  3. Step 3: Cross multiply
    128,804x = 177,715.88 × 74,342.84
  4. Step 4: Simplify right side
    128,804x = 13,211,903,232.30
  5. Step 5: Solve for x
    x = 13,211,903,232.30/128,804
  6. Step 6: Final answer
    x = 102,573.70

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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.