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Finding the Fourth Proportional to 141,486, 212,230.44 and 42,990

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Solution

The fourth proportional to 141,486, 212,230.44 and 42,990 is: 64,485.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,486 : 212,230.44 = 42,990 : x
  2. Step 2: Convert to fraction form
    141,486/212,230.44 = 42,990/x
  3. Step 3: Cross multiply
    141,486x = 212,230.44 × 42,990
  4. Step 4: Simplify right side
    141,486x = 9,123,786,615.60
  5. Step 5: Solve for x
    x = 9,123,786,615.60/141,486
  6. Step 6: Final answer
    x = 64,485.44

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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.