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Finding the Fourth Proportional to 85,539.40, 128,066.10 and 80,884.60

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Solution

The fourth proportional to 85,539.40, 128,066.10 and 80,884.60 is: 121,097.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,539.40 : 128,066.10 = 80,884.60 : x
  2. Step 2: Convert to fraction form
    85,539.40/128,066.10 = 80,884.60/x
  3. Step 3: Cross multiply
    85,539.40x = 128,066.10 × 80,884.60
  4. Step 4: Simplify right side
    85,539.40x = 10,358,575,272.06
  5. Step 5: Solve for x
    x = 10,358,575,272.06/85,539.40
  6. Step 6: Final answer
    x = 121,097.12

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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.