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Finding the Fourth Proportional to 139,607.65, 209,379.88 and 39,765.63

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Solution

The fourth proportional to 139,607.65, 209,379.88 and 39,765.63 is: 59,639.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,607.65 : 209,379.88 = 39,765.63 : x
  2. Step 2: Convert to fraction form
    139,607.65/209,379.88 = 39,765.63/x
  3. Step 3: Cross multiply
    139,607.65x = 209,379.88 × 39,765.63
  4. Step 4: Simplify right side
    139,607.65x = 8,326,122,638.70
  5. Step 5: Solve for x
    x = 8,326,122,638.70/139,607.65
  6. Step 6: Final answer
    x = 59,639.45

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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.