Home / 85,977.60-128,966.40-77,229.60

Finding the Fourth Proportional to 85,977.60, 128,966.40 and 77,229.60

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Solution

The fourth proportional to 85,977.60, 128,966.40 and 77,229.60 is: 115,844.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,977.60 : 128,966.40 = 77,229.60 : x
  2. Step 2: Convert to fraction form
    85,977.60/128,966.40 = 77,229.60/x
  3. Step 3: Cross multiply
    85,977.60x = 128,966.40 × 77,229.60
  4. Step 4: Simplify right side
    85,977.60x = 9,960,023,485.44
  5. Step 5: Solve for x
    x = 9,960,023,485.44/85,977.60
  6. Step 6: Final answer
    x = 115,844.40

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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.