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Finding the Fourth Proportional to 78,121.80, 117,182.84 and 28,237.10

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Solution

The fourth proportional to 78,121.80, 117,182.84 and 28,237.10 is: 42,355.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,121.80 : 117,182.84 = 28,237.10 : x
  2. Step 2: Convert to fraction form
    78,121.80/117,182.84 = 28,237.10/x
  3. Step 3: Cross multiply
    78,121.80x = 117,182.84 × 28,237.10
  4. Step 4: Simplify right side
    78,121.80x = 3,308,902,844.26
  5. Step 5: Solve for x
    x = 3,308,902,844.26/78,121.80
  6. Step 6: Final answer
    x = 42,355.69

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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.