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Finding the Fourth Proportional to 85,817.60, 128,726.40 and 72,857.60

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Solution

The fourth proportional to 85,817.60, 128,726.40 and 72,857.60 is: 109,286.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,817.60 : 128,726.40 = 72,857.60 : x
  2. Step 2: Convert to fraction form
    85,817.60/128,726.40 = 72,857.60/x
  3. Step 3: Cross multiply
    85,817.60x = 128,726.40 × 72,857.60
  4. Step 4: Simplify right side
    85,817.60x = 9,378,696,560.64
  5. Step 5: Solve for x
    x = 9,378,696,560.64/85,817.60
  6. Step 6: Final answer
    x = 109,286.40

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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.