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Finding the Fourth Proportional to 208,116.87, 312,048.88 and 81,605.55

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Solution

The fourth proportional to 208,116.87, 312,048.88 and 81,605.55 is: 122,358.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,116.87 : 312,048.88 = 81,605.55 : x
  2. Step 2: Convert to fraction form
    208,116.87/312,048.88 = 81,605.55/x
  3. Step 3: Cross multiply
    208,116.87x = 312,048.88 × 81,605.55
  4. Step 4: Simplify right side
    208,116.87x = 25,464,920,149.21
  5. Step 5: Solve for x
    x = 25,464,920,149.21/208,116.87
  6. Step 6: Final answer
    x = 122,358.75

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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.