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Finding the Fourth Proportional to 78,895.80, 118,314.90 and 39,439.80

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Solution

The fourth proportional to 78,895.80, 118,314.90 and 39,439.80 is: 59,145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,895.80 : 118,314.90 = 39,439.80 : x
  2. Step 2: Convert to fraction form
    78,895.80/118,314.90 = 39,439.80/x
  3. Step 3: Cross multiply
    78,895.80x = 118,314.90 × 39,439.80
  4. Step 4: Simplify right side
    78,895.80x = 4,666,315,993.02
  5. Step 5: Solve for x
    x = 4,666,315,993.02/78,895.80
  6. Step 6: Final answer
    x = 59,145.30

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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.