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Finding the Fourth Proportional to 128,970.48, 177,928.40 and 74,486.64

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Solution

The fourth proportional to 128,970.48, 177,928.40 and 74,486.64 is: 102,762.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,970.48 : 177,928.40 = 74,486.64 : x
  2. Step 2: Convert to fraction form
    128,970.48/177,928.40 = 74,486.64/x
  3. Step 3: Cross multiply
    128,970.48x = 177,928.40 × 74,486.64
  4. Step 4: Simplify right side
    128,970.48x = 13,253,288,676.58
  5. Step 5: Solve for x
    x = 13,253,288,676.58/128,970.48
  6. Step 6: Final answer
    x = 102,762.19

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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.