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Finding the Fourth Proportional to 128,779.88, 177,701.72 and 72,190.04

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Solution

The fourth proportional to 128,779.88, 177,701.72 and 72,190.04 is: 99,614.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.88 : 177,701.72 = 72,190.04 : x
  2. Step 2: Convert to fraction form
    128,779.88/177,701.72 = 72,190.04/x
  3. Step 3: Cross multiply
    128,779.88x = 177,701.72 × 72,190.04
  4. Step 4: Simplify right side
    128,779.88x = 12,828,293,025.41
  5. Step 5: Solve for x
    x = 12,828,293,025.41/128,779.88
  6. Step 6: Final answer
    x = 99,614.11

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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.