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Finding the Fourth Proportional to 21,429, 29,539.62 and 18,428.76

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Solution

The fourth proportional to 21,429, 29,539.62 and 18,428.76 is: 25,403.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,429 : 29,539.62 = 18,428.76 : x
  2. Step 2: Convert to fraction form
    21,429/29,539.62 = 18,428.76/x
  3. Step 3: Cross multiply
    21,429x = 29,539.62 × 18,428.76
  4. Step 4: Simplify right side
    21,429x = 544,378,567.47
  5. Step 5: Solve for x
    x = 544,378,567.47/21,429
  6. Step 6: Final answer
    x = 25,403.83

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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.