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Finding the Fourth Proportional to 21,307.88, 29,404.28 and 13,354.50

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Solution

The fourth proportional to 21,307.88, 29,404.28 and 13,354.50 is: 18,428.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.88 : 29,404.28 = 13,354.50 : x
  2. Step 2: Convert to fraction form
    21,307.88/29,404.28 = 13,354.50/x
  3. Step 3: Cross multiply
    21,307.88x = 29,404.28 × 13,354.50
  4. Step 4: Simplify right side
    21,307.88x = 392,679,457.26
  5. Step 5: Solve for x
    x = 392,679,457.26/21,307.88
  6. Step 6: Final answer
    x = 18,428.84

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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.