Home / 31,986.40-47,979.60-11,207.20

Finding the Fourth Proportional to 31,986.40, 47,979.60 and 11,207.20

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Solution

The fourth proportional to 31,986.40, 47,979.60 and 11,207.20 is: 16,810.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,986.40 : 47,979.60 = 11,207.20 : x
  2. Step 2: Convert to fraction form
    31,986.40/47,979.60 = 11,207.20/x
  3. Step 3: Cross multiply
    31,986.40x = 47,979.60 × 11,207.20
  4. Step 4: Simplify right side
    31,986.40x = 537,716,973.12
  5. Step 5: Solve for x
    x = 537,716,973.12/31,986.40
  6. Step 6: Final answer
    x = 16,810.80

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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.