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Finding the Fourth Proportional to 209,955.60, 315,006.30 and 91,711.80

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Solution

The fourth proportional to 209,955.60, 315,006.30 and 91,711.80 is: 137,599.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,955.60 : 315,006.30 = 91,711.80 : x
  2. Step 2: Convert to fraction form
    209,955.60/315,006.30 = 91,711.80/x
  3. Step 3: Cross multiply
    209,955.60x = 315,006.30 × 91,711.80
  4. Step 4: Simplify right side
    209,955.60x = 28,889,794,784.34
  5. Step 5: Solve for x
    x = 28,889,794,784.34/209,955.60
  6. Step 6: Final answer
    x = 137,599.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.