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Finding the Fourth Proportional to 78,485.70, 117,728.55 and 19,320.60

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Solution

The fourth proportional to 78,485.70, 117,728.55 and 19,320.60 is: 28,980.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,485.70 : 117,728.55 = 19,320.60 : x
  2. Step 2: Convert to fraction form
    78,485.70/117,728.55 = 19,320.60/x
  3. Step 3: Cross multiply
    78,485.70x = 117,728.55 × 19,320.60
  4. Step 4: Simplify right side
    78,485.70x = 2,274,586,223.13
  5. Step 5: Solve for x
    x = 2,274,586,223.13/78,485.70
  6. Step 6: Final answer
    x = 28,980.90

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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.