Home / 13,985.90-20,982.47-5,220.89

Finding the Fourth Proportional to 13,985.90, 20,982.47 and 5,220.89

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Solution

The fourth proportional to 13,985.90, 20,982.47 and 5,220.89 is: 7,832.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.90 : 20,982.47 = 5,220.89 : x
  2. Step 2: Convert to fraction form
    13,985.90/20,982.47 = 5,220.89/x
  3. Step 3: Cross multiply
    13,985.90x = 20,982.47 × 5,220.89
  4. Step 4: Simplify right side
    13,985.90x = 109,547,141.69
  5. Step 5: Solve for x
    x = 109,547,141.69/13,985.90
  6. Step 6: Final answer
    x = 7,832.68

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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.