Home / 13,991.20-21,011.10-7,430.20

Finding the Fourth Proportional to 13,991.20, 21,011.10 and 7,430.20

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Solution

The fourth proportional to 13,991.20, 21,011.10 and 7,430.20 is: 11,158.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,991.20 : 21,011.10 = 7,430.20 : x
  2. Step 2: Convert to fraction form
    13,991.20/21,011.10 = 7,430.20/x
  3. Step 3: Cross multiply
    13,991.20x = 21,011.10 × 7,430.20
  4. Step 4: Simplify right side
    13,991.20x = 156,116,675.22
  5. Step 5: Solve for x
    x = 156,116,675.22/13,991.20
  6. Step 6: Final answer
    x = 11,158.20

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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.