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Finding the Fourth Proportional to 128,473.01, 177,288.89 and 71,114.67

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Solution

The fourth proportional to 128,473.01, 177,288.89 and 71,114.67 is: 98,136.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,473.01 : 177,288.89 = 71,114.67 : x
  2. Step 2: Convert to fraction form
    128,473.01/177,288.89 = 71,114.67/x
  3. Step 3: Cross multiply
    128,473.01x = 177,288.89 × 71,114.67
  4. Step 4: Simplify right side
    128,473.01x = 12,607,840,551.44
  5. Step 5: Solve for x
    x = 12,607,840,551.44/128,473.01
  6. Step 6: Final answer
    x = 98,136.11

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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.