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Finding the Fourth Proportional to 128,336.40, 177,099.12 and 70,972

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Solution

The fourth proportional to 128,336.40, 177,099.12 and 70,972 is: 97,938.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,336.40 : 177,099.12 = 70,972 : x
  2. Step 2: Convert to fraction form
    128,336.40/177,099.12 = 70,972/x
  3. Step 3: Cross multiply
    128,336.40x = 177,099.12 × 70,972
  4. Step 4: Simplify right side
    128,336.40x = 12,569,078,744.64
  5. Step 5: Solve for x
    x = 12,569,078,744.64/128,336.40
  6. Step 6: Final answer
    x = 97,938.53

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.