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Finding the Fourth Proportional to 19,785.92, 29,686.68 and 8,684.88

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Solution

The fourth proportional to 19,785.92, 29,686.68 and 8,684.88 is: 13,030.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,785.92 : 29,686.68 = 8,684.88 : x
  2. Step 2: Convert to fraction form
    19,785.92/29,686.68 = 8,684.88/x
  3. Step 3: Cross multiply
    19,785.92x = 29,686.68 × 8,684.88
  4. Step 4: Simplify right side
    19,785.92x = 257,825,253.40
  5. Step 5: Solve for x
    x = 257,825,253.40/19,785.92
  6. Step 6: Final answer
    x = 13,030.74

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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.