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Finding the Fourth Proportional to 209,987.70, 314,899.65 and 91,578.30

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Solution

The fourth proportional to 209,987.70, 314,899.65 and 91,578.30 is: 137,331.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,987.70 : 314,899.65 = 91,578.30 : x
  2. Step 2: Convert to fraction form
    209,987.70/314,899.65 = 91,578.30/x
  3. Step 3: Cross multiply
    209,987.70x = 314,899.65 × 91,578.30
  4. Step 4: Simplify right side
    209,987.70x = 28,837,974,617.60
  5. Step 5: Solve for x
    x = 28,837,974,617.60/209,987.70
  6. Step 6: Final answer
    x = 137,331.73

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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.