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Finding the Fourth Proportional to 21,167.60, 31,686.60 and 15,335.60

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Solution

The fourth proportional to 21,167.60, 31,686.60 and 15,335.60 is: 22,956.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.60 : 31,686.60 = 15,335.60 : x
  2. Step 2: Convert to fraction form
    21,167.60/31,686.60 = 15,335.60/x
  3. Step 3: Cross multiply
    21,167.60x = 31,686.60 × 15,335.60
  4. Step 4: Simplify right side
    21,167.60x = 485,933,022.96
  5. Step 5: Solve for x
    x = 485,933,022.96/21,167.60
  6. Step 6: Final answer
    x = 22,956.45

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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.