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Finding the Fourth Proportional to 132,005.80, 198,008.70 and 85,311.40

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Solution

The fourth proportional to 132,005.80, 198,008.70 and 85,311.40 is: 127,967.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,005.80 : 198,008.70 = 85,311.40 : x
  2. Step 2: Convert to fraction form
    132,005.80/198,008.70 = 85,311.40/x
  3. Step 3: Cross multiply
    132,005.80x = 198,008.70 × 85,311.40
  4. Step 4: Simplify right side
    132,005.80x = 16,892,399,409.18
  5. Step 5: Solve for x
    x = 16,892,399,409.18/132,005.80
  6. Step 6: Final answer
    x = 127,967.10

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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.