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Finding the Fourth Proportional to 18,916.40, 28,390.80 and 8,402.60

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Solution

The fourth proportional to 18,916.40, 28,390.80 and 8,402.60 is: 12,611.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,916.40 : 28,390.80 = 8,402.60 : x
  2. Step 2: Convert to fraction form
    18,916.40/28,390.80 = 8,402.60/x
  3. Step 3: Cross multiply
    18,916.40x = 28,390.80 × 8,402.60
  4. Step 4: Simplify right side
    18,916.40x = 238,556,536.08
  5. Step 5: Solve for x
    x = 238,556,536.08/18,916.40
  6. Step 6: Final answer
    x = 12,611.10

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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.