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Finding the Fourth Proportional to 85,410.30, 117,915.39 and 56,768.79

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Solution

The fourth proportional to 85,410.30, 117,915.39 and 56,768.79 is: 78,373.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,410.30 : 117,915.39 = 56,768.79 : x
  2. Step 2: Convert to fraction form
    85,410.30/117,915.39 = 56,768.79/x
  3. Step 3: Cross multiply
    85,410.30x = 117,915.39 × 56,768.79
  4. Step 4: Simplify right side
    85,410.30x = 6,693,914,012.68
  5. Step 5: Solve for x
    x = 6,693,914,012.68/85,410.30
  6. Step 6: Final answer
    x = 78,373.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.