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Finding the Fourth Proportional to 339,811.80, 509,715.90 and 87,091.80

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Solution

The fourth proportional to 339,811.80, 509,715.90 and 87,091.80 is: 130,637.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,811.80 : 509,715.90 = 87,091.80 : x
  2. Step 2: Convert to fraction form
    339,811.80/509,715.90 = 87,091.80/x
  3. Step 3: Cross multiply
    339,811.80x = 509,715.90 × 87,091.80
  4. Step 4: Simplify right side
    339,811.80x = 44,392,075,219.62
  5. Step 5: Solve for x
    x = 44,392,075,219.62/339,811.80
  6. Step 6: Final answer
    x = 130,637.24

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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.