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Finding the Fourth Proportional to 19,999.40, 29,999.10 and 18,930.20

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Solution

The fourth proportional to 19,999.40, 29,999.10 and 18,930.20 is: 28,395.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,999.40 : 29,999.10 = 18,930.20 : x
  2. Step 2: Convert to fraction form
    19,999.40/29,999.10 = 18,930.20/x
  3. Step 3: Cross multiply
    19,999.40x = 29,999.10 × 18,930.20
  4. Step 4: Simplify right side
    19,999.40x = 567,888,962.82
  5. Step 5: Solve for x
    x = 567,888,962.82/19,999.40
  6. Step 6: Final answer
    x = 28,395.30

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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.