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Finding the Fourth Proportional to 85,943.60, 128,915.40 and 68,228.90

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Solution

The fourth proportional to 85,943.60, 128,915.40 and 68,228.90 is: 102,343.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,943.60 : 128,915.40 = 68,228.90 : x
  2. Step 2: Convert to fraction form
    85,943.60/128,915.40 = 68,228.90/x
  3. Step 3: Cross multiply
    85,943.60x = 128,915.40 × 68,228.90
  4. Step 4: Simplify right side
    85,943.60x = 8,795,755,935.06
  5. Step 5: Solve for x
    x = 8,795,755,935.06/85,943.60
  6. Step 6: Final answer
    x = 102,343.35

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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.