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Finding the Fourth Proportional to 85,866.40, 128,799.60 and 81,492.40

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Solution

The fourth proportional to 85,866.40, 128,799.60 and 81,492.40 is: 122,238.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,866.40 : 128,799.60 = 81,492.40 : x
  2. Step 2: Convert to fraction form
    85,866.40/128,799.60 = 81,492.40/x
  3. Step 3: Cross multiply
    85,866.40x = 128,799.60 × 81,492.40
  4. Step 4: Simplify right side
    85,866.40x = 10,496,188,523.04
  5. Step 5: Solve for x
    x = 10,496,188,523.04/85,866.40
  6. Step 6: Final answer
    x = 122,238.60

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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.