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Finding the Fourth Proportional to 13,421, 20,135.07 and 4,655.90

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Solution

The fourth proportional to 13,421, 20,135.07 and 4,655.90 is: 6,985.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421 : 20,135.07 = 4,655.90 : x
  2. Step 2: Convert to fraction form
    13,421/20,135.07 = 4,655.90/x
  3. Step 3: Cross multiply
    13,421x = 20,135.07 × 4,655.90
  4. Step 4: Simplify right side
    13,421x = 93,746,872.41
  5. Step 5: Solve for x
    x = 93,746,872.41/13,421
  6. Step 6: Final answer
    x = 6,985.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.