Home / 31,686.40-47,511.90-12,979.48

Finding the Fourth Proportional to 31,686.40, 47,511.90 and 12,979.48

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Solution

The fourth proportional to 31,686.40, 47,511.90 and 12,979.48 is: 19,461.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,686.40 : 47,511.90 = 12,979.48 : x
  2. Step 2: Convert to fraction form
    31,686.40/47,511.90 = 12,979.48/x
  3. Step 3: Cross multiply
    31,686.40x = 47,511.90 × 12,979.48
  4. Step 4: Simplify right side
    31,686.40x = 616,679,755.81
  5. Step 5: Solve for x
    x = 616,679,755.81/31,686.40
  6. Step 6: Final answer
    x = 19,461.97

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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.