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Finding the Fourth Proportional to 21,036.80, 31,553.94 and 7,888.07

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Solution

The fourth proportional to 21,036.80, 31,553.94 and 7,888.07 is: 11,831.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,036.80 : 31,553.94 = 7,888.07 : x
  2. Step 2: Convert to fraction form
    21,036.80/31,553.94 = 7,888.07/x
  3. Step 3: Cross multiply
    21,036.80x = 31,553.94 × 7,888.07
  4. Step 4: Simplify right side
    21,036.80x = 248,899,529.73
  5. Step 5: Solve for x
    x = 248,899,529.73/21,036.80
  6. Step 6: Final answer
    x = 11,831.63

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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.