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Finding the Fourth Proportional to 85,989.60, 128,984.40 and 50,911.20

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Solution

The fourth proportional to 85,989.60, 128,984.40 and 50,911.20 is: 76,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,989.60 : 128,984.40 = 50,911.20 : x
  2. Step 2: Convert to fraction form
    85,989.60/128,984.40 = 50,911.20/x
  3. Step 3: Cross multiply
    85,989.60x = 128,984.40 × 50,911.20
  4. Step 4: Simplify right side
    85,989.60x = 6,566,750,585.28
  5. Step 5: Solve for x
    x = 6,566,750,585.28/85,989.60
  6. Step 6: Final answer
    x = 76,366.80

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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.