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Finding the Fourth Proportional to 18,719.81, 28,116.98 and 11,712.23

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Solution

The fourth proportional to 18,719.81, 28,116.98 and 11,712.23 is: 17,591.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,719.81 : 28,116.98 = 11,712.23 : x
  2. Step 2: Convert to fraction form
    18,719.81/28,116.98 = 11,712.23/x
  3. Step 3: Cross multiply
    18,719.81x = 28,116.98 × 11,712.23
  4. Step 4: Simplify right side
    18,719.81x = 329,312,536.67
  5. Step 5: Solve for x
    x = 329,312,536.67/18,719.81
  6. Step 6: Final answer
    x = 17,591.66

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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.