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Finding the Fourth Proportional to 85,810.80, 128,716.20 and 78,207.60

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Solution

The fourth proportional to 85,810.80, 128,716.20 and 78,207.60 is: 117,311.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,810.80 : 128,716.20 = 78,207.60 : x
  2. Step 2: Convert to fraction form
    85,810.80/128,716.20 = 78,207.60/x
  3. Step 3: Cross multiply
    85,810.80x = 128,716.20 × 78,207.60
  4. Step 4: Simplify right side
    85,810.80x = 10,066,585,083.12
  5. Step 5: Solve for x
    x = 10,066,585,083.12/85,810.80
  6. Step 6: Final answer
    x = 117,311.40

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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.