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Finding the Fourth Proportional to 18,421.60, 27,632.40 and 17,615.20

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Solution

The fourth proportional to 18,421.60, 27,632.40 and 17,615.20 is: 26,422.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.60 : 27,632.40 = 17,615.20 : x
  2. Step 2: Convert to fraction form
    18,421.60/27,632.40 = 17,615.20/x
  3. Step 3: Cross multiply
    18,421.60x = 27,632.40 × 17,615.20
  4. Step 4: Simplify right side
    18,421.60x = 486,750,252.48
  5. Step 5: Solve for x
    x = 486,750,252.48/18,421.60
  6. Step 6: Final answer
    x = 26,422.80

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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.