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Finding the Fourth Proportional to 18,959.90, 28,379.87 and 11,915.53

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Solution

The fourth proportional to 18,959.90, 28,379.87 and 11,915.53 is: 17,835.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.90 : 28,379.87 = 11,915.53 : x
  2. Step 2: Convert to fraction form
    18,959.90/28,379.87 = 11,915.53/x
  3. Step 3: Cross multiply
    18,959.90x = 28,379.87 × 11,915.53
  4. Step 4: Simplify right side
    18,959.90x = 338,161,192.38
  5. Step 5: Solve for x
    x = 338,161,192.38/18,959.90
  6. Step 6: Final answer
    x = 17,835.60

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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.