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Finding the Fourth Proportional to 78,905.80, 118,329.90 and 39,449.80

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Solution

The fourth proportional to 78,905.80, 118,329.90 and 39,449.80 is: 59,160.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,905.80 : 118,329.90 = 39,449.80 : x
  2. Step 2: Convert to fraction form
    78,905.80/118,329.90 = 39,449.80/x
  3. Step 3: Cross multiply
    78,905.80x = 118,329.90 × 39,449.80
  4. Step 4: Simplify right side
    78,905.80x = 4,668,090,889.02
  5. Step 5: Solve for x
    x = 4,668,090,889.02/78,905.80
  6. Step 6: Final answer
    x = 59,160.30

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1.5x scale

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.