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Finding the Fourth Proportional to 19,980.90, 29,960.55 and 8,295.30

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Solution

The fourth proportional to 19,980.90, 29,960.55 and 8,295.30 is: 12,438.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980.90 : 29,960.55 = 8,295.30 : x
  2. Step 2: Convert to fraction form
    19,980.90/29,960.55 = 8,295.30/x
  3. Step 3: Cross multiply
    19,980.90x = 29,960.55 × 8,295.30
  4. Step 4: Simplify right side
    19,980.90x = 248,531,750.42
  5. Step 5: Solve for x
    x = 248,531,750.42/19,980.90
  6. Step 6: Final answer
    x = 12,438.47

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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.