Home / 20,979.78-31,461.72-6,935.60

Finding the Fourth Proportional to 20,979.78, 31,461.72 and 6,935.60

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Solution

The fourth proportional to 20,979.78, 31,461.72 and 6,935.60 is: 10,400.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.78 : 31,461.72 = 6,935.60 : x
  2. Step 2: Convert to fraction form
    20,979.78/31,461.72 = 6,935.60/x
  3. Step 3: Cross multiply
    20,979.78x = 31,461.72 × 6,935.60
  4. Step 4: Simplify right side
    20,979.78x = 218,205,905.23
  5. Step 5: Solve for x
    x = 218,205,905.23/20,979.78
  6. Step 6: Final answer
    x = 10,400.77

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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.