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Finding the Fourth Proportional to 18,421.31, 25,420.70 and 10,462.70

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Solution

The fourth proportional to 18,421.31, 25,420.70 and 10,462.70 is: 14,438.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.31 : 25,420.70 = 10,462.70 : x
  2. Step 2: Convert to fraction form
    18,421.31/25,420.70 = 10,462.70/x
  3. Step 3: Cross multiply
    18,421.31x = 25,420.70 × 10,462.70
  4. Step 4: Simplify right side
    18,421.31x = 265,969,247.60
  5. Step 5: Solve for x
    x = 265,969,247.60/18,421.31
  6. Step 6: Final answer
    x = 14,438.13

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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.