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Finding the Fourth Proportional to 21,607.59, 29,819.63 and 12,655.77

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Solution

The fourth proportional to 21,607.59, 29,819.63 and 12,655.77 is: 17,465.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,607.59 : 29,819.63 = 12,655.77 : x
  2. Step 2: Convert to fraction form
    21,607.59/29,819.63 = 12,655.77/x
  3. Step 3: Cross multiply
    21,607.59x = 29,819.63 × 12,655.77
  4. Step 4: Simplify right side
    21,607.59x = 377,390,315.49
  5. Step 5: Solve for x
    x = 377,390,315.49/21,607.59
  6. Step 6: Final answer
    x = 17,465.64

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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.