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Finding the Fourth Proportional to 103,339.80, 154,779.30 and 84,907.80

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Solution

The fourth proportional to 103,339.80, 154,779.30 and 84,907.80 is: 127,172.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,339.80 : 154,779.30 = 84,907.80 : x
  2. Step 2: Convert to fraction form
    103,339.80/154,779.30 = 84,907.80/x
  3. Step 3: Cross multiply
    103,339.80x = 154,779.30 × 84,907.80
  4. Step 4: Simplify right side
    103,339.80x = 13,141,969,848.54
  5. Step 5: Solve for x
    x = 13,141,969,848.54/103,339.80
  6. Step 6: Final answer
    x = 127,172.39

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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.