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Finding the Fourth Proportional to 85,404.60, 128,106.90 and 81,322.20

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Solution

The fourth proportional to 85,404.60, 128,106.90 and 81,322.20 is: 121,983.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,404.60 : 128,106.90 = 81,322.20 : x
  2. Step 2: Convert to fraction form
    85,404.60/128,106.90 = 81,322.20/x
  3. Step 3: Cross multiply
    85,404.60x = 128,106.90 × 81,322.20
  4. Step 4: Simplify right side
    85,404.60x = 10,417,934,943.18
  5. Step 5: Solve for x
    x = 10,417,934,943.18/85,404.60
  6. Step 6: Final answer
    x = 121,983.30

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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.