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Finding the Fourth Proportional to 16,985.20, 25,429.20 and 13,064.80

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Solution

The fourth proportional to 16,985.20, 25,429.20 and 13,064.80 is: 19,559.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    16,985.20 : 25,429.20 = 13,064.80 : x
  2. Step 2: Convert to fraction form
    16,985.20/25,429.20 = 13,064.80/x
  3. Step 3: Cross multiply
    16,985.20x = 25,429.20 × 13,064.80
  4. Step 4: Simplify right side
    16,985.20x = 332,227,412.16
  5. Step 5: Solve for x
    x = 332,227,412.16/16,985.20
  6. Step 6: Final answer
    x = 19,559.82

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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.