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Finding the Fourth Proportional to 112,915.20, 169,027.20 and 81,811.20

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Solution

The fourth proportional to 112,915.20, 169,027.20 and 81,811.20 is: 122,466.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,915.20 : 169,027.20 = 81,811.20 : x
  2. Step 2: Convert to fraction form
    112,915.20/169,027.20 = 81,811.20/x
  3. Step 3: Cross multiply
    112,915.20x = 169,027.20 × 81,811.20
  4. Step 4: Simplify right side
    112,915.20x = 13,828,318,064.64
  5. Step 5: Solve for x
    x = 13,828,318,064.64/112,915.20
  6. Step 6: Final answer
    x = 122,466.40

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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.