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Finding the Fourth Proportional to 28,956.40, 39,964.12 and 18,347.02

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Solution

The fourth proportional to 28,956.40, 39,964.12 and 18,347.02 is: 25,321.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,956.40 : 39,964.12 = 18,347.02 : x
  2. Step 2: Convert to fraction form
    28,956.40/39,964.12 = 18,347.02/x
  3. Step 3: Cross multiply
    28,956.40x = 39,964.12 × 18,347.02
  4. Step 4: Simplify right side
    28,956.40x = 733,222,508.92
  5. Step 5: Solve for x
    x = 733,222,508.92/28,956.40
  6. Step 6: Final answer
    x = 25,321.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.