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Finding the Fourth Proportional to 128,903.32, 177,883.91 and 71,539.31

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Solution

The fourth proportional to 128,903.32, 177,883.91 and 71,539.31 is: 98,722.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,903.32 : 177,883.91 = 71,539.31 : x
  2. Step 2: Convert to fraction form
    128,903.32/177,883.91 = 71,539.31/x
  3. Step 3: Cross multiply
    128,903.32x = 177,883.91 × 71,539.31
  4. Step 4: Simplify right side
    128,903.32x = 12,725,692,181.50
  5. Step 5: Solve for x
    x = 12,725,692,181.50/128,903.32
  6. Step 6: Final answer
    x = 98,722.77

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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.