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Finding the Fourth Proportional to 78,485.60, 117,728.40 and 48,807.20

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Solution

The fourth proportional to 78,485.60, 117,728.40 and 48,807.20 is: 73,210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,485.60 : 117,728.40 = 48,807.20 : x
  2. Step 2: Convert to fraction form
    78,485.60/117,728.40 = 48,807.20/x
  3. Step 3: Cross multiply
    78,485.60x = 117,728.40 × 48,807.20
  4. Step 4: Simplify right side
    78,485.60x = 5,745,993,564.48
  5. Step 5: Solve for x
    x = 5,745,993,564.48/78,485.60
  6. Step 6: Final answer
    x = 73,210.80

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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.