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Finding the Fourth Proportional to 22,926.50, 31,639.05 and 12,990.50

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Solution

The fourth proportional to 22,926.50, 31,639.05 and 12,990.50 is: 17,927.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,926.50 : 31,639.05 = 12,990.50 : x
  2. Step 2: Convert to fraction form
    22,926.50/31,639.05 = 12,990.50/x
  3. Step 3: Cross multiply
    22,926.50x = 31,639.05 × 12,990.50
  4. Step 4: Simplify right side
    22,926.50x = 411,007,079.03
  5. Step 5: Solve for x
    x = 411,007,079.03/22,926.50
  6. Step 6: Final answer
    x = 17,927.16

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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.