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Finding the Fourth Proportional to 139,491.20, 209,220.60 and 39,666.80

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Solution

The fourth proportional to 139,491.20, 209,220.60 and 39,666.80 is: 59,495.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,491.20 : 209,220.60 = 39,666.80 : x
  2. Step 2: Convert to fraction form
    139,491.20/209,220.60 = 39,666.80/x
  3. Step 3: Cross multiply
    139,491.20x = 209,220.60 × 39,666.80
  4. Step 4: Simplify right side
    139,491.20x = 8,299,111,696.08
  5. Step 5: Solve for x
    x = 8,299,111,696.08/139,491.20
  6. Step 6: Final answer
    x = 59,495.59

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1.5x scale

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.