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Finding the Fourth Proportional to 21,311.40, 31,967.10 and 18,719.40

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Solution

The fourth proportional to 21,311.40, 31,967.10 and 18,719.40 is: 28,079.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,311.40 : 31,967.10 = 18,719.40 : x
  2. Step 2: Convert to fraction form
    21,311.40/31,967.10 = 18,719.40/x
  3. Step 3: Cross multiply
    21,311.40x = 31,967.10 × 18,719.40
  4. Step 4: Simplify right side
    21,311.40x = 598,404,931.74
  5. Step 5: Solve for x
    x = 598,404,931.74/21,311.40
  6. Step 6: Final answer
    x = 28,079.10

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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.