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Finding the Fourth Proportional to 103,315.60, 154,973.40 and 85,819.60

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Solution

The fourth proportional to 103,315.60, 154,973.40 and 85,819.60 is: 128,729.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,315.60 : 154,973.40 = 85,819.60 : x
  2. Step 2: Convert to fraction form
    103,315.60/154,973.40 = 85,819.60/x
  3. Step 3: Cross multiply
    103,315.60x = 154,973.40 × 85,819.60
  4. Step 4: Simplify right side
    103,315.60x = 13,299,755,198.64
  5. Step 5: Solve for x
    x = 13,299,755,198.64/103,315.60
  6. Step 6: Final answer
    x = 128,729.40

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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.