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Finding the Fourth Proportional to 128,779.02, 177,765.39 and 98,562.54

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Solution

The fourth proportional to 128,779.02, 177,765.39 and 98,562.54 is: 136,054.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.02 : 177,765.39 = 98,562.54 : x
  2. Step 2: Convert to fraction form
    128,779.02/177,765.39 = 98,562.54/x
  3. Step 3: Cross multiply
    128,779.02x = 177,765.39 × 98,562.54
  4. Step 4: Simplify right side
    128,779.02x = 17,521,008,362.49
  5. Step 5: Solve for x
    x = 17,521,008,362.49/128,779.02
  6. Step 6: Final answer
    x = 136,054.84

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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.