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Finding the Fourth Proportional to 78,465.80, 117,698.70 and 72,014.60

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Solution

The fourth proportional to 78,465.80, 117,698.70 and 72,014.60 is: 108,021.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,465.80 : 117,698.70 = 72,014.60 : x
  2. Step 2: Convert to fraction form
    78,465.80/117,698.70 = 72,014.60/x
  3. Step 3: Cross multiply
    78,465.80x = 117,698.70 × 72,014.60
  4. Step 4: Simplify right side
    78,465.80x = 8,476,024,801.02
  5. Step 5: Solve for x
    x = 8,476,024,801.02/78,465.80
  6. Step 6: Final answer
    x = 108,021.90

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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.