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Finding the Fourth Proportional to 208,478.67, 312,740.99 and 66,290.69

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Solution

The fourth proportional to 208,478.67, 312,740.99 and 66,290.69 is: 99,443.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,478.67 : 312,740.99 = 66,290.69 : x
  2. Step 2: Convert to fraction form
    208,478.67/312,740.99 = 66,290.69/x
  3. Step 3: Cross multiply
    208,478.67x = 312,740.99 × 66,290.69
  4. Step 4: Simplify right side
    208,478.67x = 20,731,815,331.09
  5. Step 5: Solve for x
    x = 20,731,815,331.09/208,478.67
  6. Step 6: Final answer
    x = 99,443.34

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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.