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Finding the Fourth Proportional to 18,420.64, 25,420.72 and 10,037.12

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Solution

The fourth proportional to 18,420.64, 25,420.72 and 10,037.12 is: 13,851.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.64 : 25,420.72 = 10,037.12 : x
  2. Step 2: Convert to fraction form
    18,420.64/25,420.72 = 10,037.12/x
  3. Step 3: Cross multiply
    18,420.64x = 25,420.72 × 10,037.12
  4. Step 4: Simplify right side
    18,420.64x = 255,150,817.13
  5. Step 5: Solve for x
    x = 255,150,817.13/18,420.64
  6. Step 6: Final answer
    x = 13,851.35

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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.