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Finding the Fourth Proportional to 23,050.79, 31,809.74 and 12,979.20

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Solution

The fourth proportional to 23,050.79, 31,809.74 and 12,979.20 is: 17,911.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    23,050.79 : 31,809.74 = 12,979.20 : x
  2. Step 2: Convert to fraction form
    23,050.79/31,809.74 = 12,979.20/x
  3. Step 3: Cross multiply
    23,050.79x = 31,809.74 × 12,979.20
  4. Step 4: Simplify right side
    23,050.79x = 412,864,977.41
  5. Step 5: Solve for x
    x = 412,864,977.41/23,050.79
  6. Step 6: Final answer
    x = 17,911.10

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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.