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Finding the Fourth Proportional to 128,653.72, 177,543.18 and 71,294.01

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Solution

The fourth proportional to 128,653.72, 177,543.18 and 71,294.01 is: 98,386.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,653.72 : 177,543.18 = 71,294.01 : x
  2. Step 2: Convert to fraction form
    128,653.72/177,543.18 = 71,294.01/x
  3. Step 3: Cross multiply
    128,653.72x = 177,543.18 × 71,294.01
  4. Step 4: Simplify right side
    128,653.72x = 12,657,764,584.56
  5. Step 5: Solve for x
    x = 12,657,764,584.56/128,653.72
  6. Step 6: Final answer
    x = 98,386.31

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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.