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Finding the Fourth Proportional to 78,999.40, 118,499.10 and 76,812.40

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Solution

The fourth proportional to 78,999.40, 118,499.10 and 76,812.40 is: 115,218.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,999.40 : 118,499.10 = 76,812.40 : x
  2. Step 2: Convert to fraction form
    78,999.40/118,499.10 = 76,812.40/x
  3. Step 3: Cross multiply
    78,999.40x = 118,499.10 × 76,812.40
  4. Step 4: Simplify right side
    78,999.40x = 9,102,200,268.84
  5. Step 5: Solve for x
    x = 9,102,200,268.84/78,999.40
  6. Step 6: Final answer
    x = 115,218.60

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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.