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Finding the Fourth Proportional to 78,485.20, 117,727.80 and 45,307.60

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Solution

The fourth proportional to 78,485.20, 117,727.80 and 45,307.60 is: 67,961.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,485.20 : 117,727.80 = 45,307.60 : x
  2. Step 2: Convert to fraction form
    78,485.20/117,727.80 = 45,307.60/x
  3. Step 3: Cross multiply
    78,485.20x = 117,727.80 × 45,307.60
  4. Step 4: Simplify right side
    78,485.20x = 5,333,964,071.28
  5. Step 5: Solve for x
    x = 5,333,964,071.28/78,485.20
  6. Step 6: Final answer
    x = 67,961.40

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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.