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Finding the Fourth Proportional to 13,421.41, 18,520.93 and 7,453.45

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Solution

The fourth proportional to 13,421.41, 18,520.93 and 7,453.45 is: 10,285.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.41 : 18,520.93 = 7,453.45 : x
  2. Step 2: Convert to fraction form
    13,421.41/18,520.93 = 7,453.45/x
  3. Step 3: Cross multiply
    13,421.41x = 18,520.93 × 7,453.45
  4. Step 4: Simplify right side
    13,421.41x = 138,044,825.71
  5. Step 5: Solve for x
    x = 138,044,825.71/13,421.41
  6. Step 6: Final answer
    x = 10,285.42

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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.