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Finding the Fourth Proportional to 30,687.64, 42,352.14 and 18,758.92

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Solution

The fourth proportional to 30,687.64, 42,352.14 and 18,758.92 is: 25,889.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,687.64 : 42,352.14 = 18,758.92 : x
  2. Step 2: Convert to fraction form
    30,687.64/42,352.14 = 18,758.92/x
  3. Step 3: Cross multiply
    30,687.64x = 42,352.14 × 18,758.92
  4. Step 4: Simplify right side
    30,687.64x = 794,480,406.09
  5. Step 5: Solve for x
    x = 794,480,406.09/30,687.64
  6. Step 6: Final answer
    x = 25,889.26

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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.