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Finding the Third Proportional to 13,428 and 19,730

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Solution

The third proportional to 13,428 and 19,730 is: 28,989.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,428 : 19,730 = 19,730 : x
  2. Step 2: Convert to fraction form
    13,428/19,730 = 19,730/x
  3. Step 3: Cross multiply
    13,428x = 19,730 × 19,730
  4. Step 4: Simplify right side
    13,428x = 389,272,900
  5. Step 5: Solve for x
    x = 389,272,900/13,428
  6. Step 6: Final answer
    x = 28,989.64

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.