Home / 10,985.20-16,483.20-5,140.80

Finding the Fourth Proportional to 10,985.20, 16,483.20 and 5,140.80

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Solution

The fourth proportional to 10,985.20, 16,483.20 and 5,140.80 is: 7,713.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,985.20 : 16,483.20 = 5,140.80 : x
  2. Step 2: Convert to fraction form
    10,985.20/16,483.20 = 5,140.80/x
  3. Step 3: Cross multiply
    10,985.20x = 16,483.20 × 5,140.80
  4. Step 4: Simplify right side
    10,985.20x = 84,736,834.56
  5. Step 5: Solve for x
    x = 84,736,834.56/10,985.20
  6. Step 6: Final answer
    x = 7,713.73

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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.