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Finding the Fourth Proportional to 21,615.80, 32,415.89 and 9,136.79

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Solution

The fourth proportional to 21,615.80, 32,415.89 and 9,136.79 is: 13,701.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,615.80 : 32,415.89 = 9,136.79 : x
  2. Step 2: Convert to fraction form
    21,615.80/32,415.89 = 9,136.79/x
  3. Step 3: Cross multiply
    21,615.80x = 32,415.89 × 9,136.79
  4. Step 4: Simplify right side
    21,615.80x = 296,176,971.83
  5. Step 5: Solve for x
    x = 296,176,971.83/21,615.80
  6. Step 6: Final answer
    x = 13,701.88

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1.5x scale

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.