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Finding the Fourth Proportional to 18,842.40, 28,265.04 and 8,455.20

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Solution

The fourth proportional to 18,842.40, 28,265.04 and 8,455.20 is: 12,683.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,842.40 : 28,265.04 = 8,455.20 : x
  2. Step 2: Convert to fraction form
    18,842.40/28,265.04 = 8,455.20/x
  3. Step 3: Cross multiply
    18,842.40x = 28,265.04 × 8,455.20
  4. Step 4: Simplify right side
    18,842.40x = 238,986,566.21
  5. Step 5: Solve for x
    x = 238,986,566.21/18,842.40
  6. Step 6: Final answer
    x = 12,683.45

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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.