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Finding the Fourth Proportional to 208,758.80, 312,907.80 and 115,331.60

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Solution

The fourth proportional to 208,758.80, 312,907.80 and 115,331.60 is: 172,870.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,758.80 : 312,907.80 = 115,331.60 : x
  2. Step 2: Convert to fraction form
    208,758.80/312,907.80 = 115,331.60/x
  3. Step 3: Cross multiply
    208,758.80x = 312,907.80 × 115,331.60
  4. Step 4: Simplify right side
    208,758.80x = 36,088,157,226.48
  5. Step 5: Solve for x
    x = 36,088,157,226.48/208,758.80
  6. Step 6: Final answer
    x = 172,870.11

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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.