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Finding the Fourth Proportional to 15,018.71, 20,703.70 and 11,821.76

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Solution

The fourth proportional to 15,018.71, 20,703.70 and 11,821.76 is: 16,296.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,018.71 : 20,703.70 = 11,821.76 : x
  2. Step 2: Convert to fraction form
    15,018.71/20,703.70 = 11,821.76/x
  3. Step 3: Cross multiply
    15,018.71x = 20,703.70 × 11,821.76
  4. Step 4: Simplify right side
    15,018.71x = 244,754,172.51
  5. Step 5: Solve for x
    x = 244,754,172.51/15,018.71
  6. Step 6: Final answer
    x = 16,296.62

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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.