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Finding the Fourth Proportional to 162,003.90, 243,005.85 and 128,542.80

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Solution

The fourth proportional to 162,003.90, 243,005.85 and 128,542.80 is: 192,814.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    162,003.90 : 243,005.85 = 128,542.80 : x
  2. Step 2: Convert to fraction form
    162,003.90/243,005.85 = 128,542.80/x
  3. Step 3: Cross multiply
    162,003.90x = 243,005.85 × 128,542.80
  4. Step 4: Simplify right side
    162,003.90x = 31,236,652,375.38
  5. Step 5: Solve for x
    x = 31,236,652,375.38/162,003.90
  6. Step 6: Final answer
    x = 192,814.20

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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.