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Finding the Fourth Proportional to 18,485.28, 25,509.52 and 10,421.52

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Solution

The fourth proportional to 18,485.28, 25,509.52 and 10,421.52 is: 14,381.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,485.28 : 25,509.52 = 10,421.52 : x
  2. Step 2: Convert to fraction form
    18,485.28/25,509.52 = 10,421.52/x
  3. Step 3: Cross multiply
    18,485.28x = 25,509.52 × 10,421.52
  4. Step 4: Simplify right side
    18,485.28x = 265,847,972.87
  5. Step 5: Solve for x
    x = 265,847,972.87/18,485.28
  6. Step 6: Final answer
    x = 14,381.60

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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.