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Finding the Fourth Proportional to 21,607.20, 32,410.80 and 21,121.20

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Solution

The fourth proportional to 21,607.20, 32,410.80 and 21,121.20 is: 31,681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,607.20 : 32,410.80 = 21,121.20 : x
  2. Step 2: Convert to fraction form
    21,607.20/32,410.80 = 21,121.20/x
  3. Step 3: Cross multiply
    21,607.20x = 32,410.80 × 21,121.20
  4. Step 4: Simplify right side
    21,607.20x = 684,554,988.96
  5. Step 5: Solve for x
    x = 684,554,988.96/21,607.20
  6. Step 6: Final answer
    x = 31,681.80

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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.