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Finding the Fourth Proportional to 102,912.90, 154,150.65 and 85,416.90

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Solution

The fourth proportional to 102,912.90, 154,150.65 and 85,416.90 is: 127,943.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,912.90 : 154,150.65 = 85,416.90 : x
  2. Step 2: Convert to fraction form
    102,912.90/154,150.65 = 85,416.90/x
  3. Step 3: Cross multiply
    102,912.90x = 154,150.65 × 85,416.90
  4. Step 4: Simplify right side
    102,912.90x = 13,167,070,655.99
  5. Step 5: Solve for x
    x = 13,167,070,655.99/102,912.90
  6. Step 6: Final answer
    x = 127,943.83

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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.