Home / 12,920.48-17,838.82-9,930.80

Finding the Fourth Proportional to 12,920.48, 17,838.82 and 9,930.80

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Solution

The fourth proportional to 12,920.48, 17,838.82 and 9,930.80 is: 13,711.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920.48 : 17,838.82 = 9,930.80 : x
  2. Step 2: Convert to fraction form
    12,920.48/17,838.82 = 9,930.80/x
  3. Step 3: Cross multiply
    12,920.48x = 17,838.82 × 9,930.80
  4. Step 4: Simplify right side
    12,920.48x = 177,153,753.66
  5. Step 5: Solve for x
    x = 177,153,753.66/12,920.48
  6. Step 6: Final answer
    x = 13,711.08

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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.