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Finding the Fourth Proportional to 22,490.70, 31,030.95 and 12,930.09

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Solution

The fourth proportional to 22,490.70, 31,030.95 and 12,930.09 is: 17,839.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,490.70 : 31,030.95 = 12,930.09 : x
  2. Step 2: Convert to fraction form
    22,490.70/31,030.95 = 12,930.09/x
  3. Step 3: Cross multiply
    22,490.70x = 31,030.95 × 12,930.09
  4. Step 4: Simplify right side
    22,490.70x = 401,232,976.29
  5. Step 5: Solve for x
    x = 401,232,976.29/22,490.70
  6. Step 6: Final answer
    x = 17,839.95

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1.5x scale

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.