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Finding the Fourth Proportional to 21,999.50, 30,346.89 and 13,038.20

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Solution

The fourth proportional to 21,999.50, 30,346.89 and 13,038.20 is: 17,985.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,999.50 : 30,346.89 = 13,038.20 : x
  2. Step 2: Convert to fraction form
    21,999.50/30,346.89 = 13,038.20/x
  3. Step 3: Cross multiply
    21,999.50x = 30,346.89 × 13,038.20
  4. Step 4: Simplify right side
    21,999.50x = 395,668,821.20
  5. Step 5: Solve for x
    x = 395,668,821.20/21,999.50
  6. Step 6: Final answer
    x = 17,985.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.