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Finding the Fourth Proportional to 10,515.80, 15,773.70 and 9,219.80

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Solution

The fourth proportional to 10,515.80, 15,773.70 and 9,219.80 is: 13,829.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,515.80 : 15,773.70 = 9,219.80 : x
  2. Step 2: Convert to fraction form
    10,515.80/15,773.70 = 9,219.80/x
  3. Step 3: Cross multiply
    10,515.80x = 15,773.70 × 9,219.80
  4. Step 4: Simplify right side
    10,515.80x = 145,430,359.26
  5. Step 5: Solve for x
    x = 145,430,359.26/10,515.80
  6. Step 6: Final answer
    x = 13,829.70

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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.