Home / 13,985.65-20,982.09-5,220.64

Finding the Fourth Proportional to 13,985.65, 20,982.09 and 5,220.64

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Solution

The fourth proportional to 13,985.65, 20,982.09 and 5,220.64 is: 7,832.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.65 : 20,982.09 = 5,220.64 : x
  2. Step 2: Convert to fraction form
    13,985.65/20,982.09 = 5,220.64/x
  3. Step 3: Cross multiply
    13,985.65x = 20,982.09 × 5,220.64
  4. Step 4: Simplify right side
    13,985.65x = 109,539,938.34
  5. Step 5: Solve for x
    x = 109,539,938.34/13,985.65
  6. Step 6: Final answer
    x = 7,832.31

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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.