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Finding the Fourth Proportional to 42,000.60, 63,015.30 and 18,643.80

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Solution

The fourth proportional to 42,000.60, 63,015.30 and 18,643.80 is: 27,972.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,000.60 : 63,015.30 = 18,643.80 : x
  2. Step 2: Convert to fraction form
    42,000.60/63,015.30 = 18,643.80/x
  3. Step 3: Cross multiply
    42,000.60x = 63,015.30 × 18,643.80
  4. Step 4: Simplify right side
    42,000.60x = 1,174,844,650.14
  5. Step 5: Solve for x
    x = 1,174,844,650.14/42,000.60
  6. Step 6: Final answer
    x = 27,972.09

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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.