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Finding the Fourth Proportional to 15,818.70, 21,812.02 and 10,785.86

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Solution

The fourth proportional to 15,818.70, 21,812.02 and 10,785.86 is: 14,872.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,818.70 : 21,812.02 = 10,785.86 : x
  2. Step 2: Convert to fraction form
    15,818.70/21,812.02 = 10,785.86/x
  3. Step 3: Cross multiply
    15,818.70x = 21,812.02 × 10,785.86
  4. Step 4: Simplify right side
    15,818.70x = 235,261,394.04
  5. Step 5: Solve for x
    x = 235,261,394.04/15,818.70
  6. Step 6: Final answer
    x = 14,872.36

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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.