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Finding the Fourth Proportional to 18,674.64, 25,808.16 and 15,312.24

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Solution

The fourth proportional to 18,674.64, 25,808.16 and 15,312.24 is: 21,161.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,674.64 : 25,808.16 = 15,312.24 : x
  2. Step 2: Convert to fraction form
    18,674.64/25,808.16 = 15,312.24/x
  3. Step 3: Cross multiply
    18,674.64x = 25,808.16 × 15,312.24
  4. Step 4: Simplify right side
    18,674.64x = 395,180,739.88
  5. Step 5: Solve for x
    x = 395,180,739.88/18,674.64
  6. Step 6: Final answer
    x = 21,161.36

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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.