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Finding the Fourth Proportional to 21,900.90, 32,855.91 and 7,110.12

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Solution

The fourth proportional to 21,900.90, 32,855.91 and 7,110.12 is: 10,666.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,900.90 : 32,855.91 = 7,110.12 : x
  2. Step 2: Convert to fraction form
    21,900.90/32,855.91 = 7,110.12/x
  3. Step 3: Cross multiply
    21,900.90x = 32,855.91 × 7,110.12
  4. Step 4: Simplify right side
    21,900.90x = 233,609,462.81
  5. Step 5: Solve for x
    x = 233,609,462.81/21,900.90
  6. Step 6: Final answer
    x = 10,666.66

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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.