Home / 15,396.69-21,239.89-9,728.71

Finding the Fourth Proportional to 15,396.69, 21,239.89 and 9,728.71

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Solution

The fourth proportional to 15,396.69, 21,239.89 and 9,728.71 is: 13,420.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,396.69 : 21,239.89 = 9,728.71 : x
  2. Step 2: Convert to fraction form
    15,396.69/21,239.89 = 9,728.71/x
  3. Step 3: Cross multiply
    15,396.69x = 21,239.89 × 9,728.71
  4. Step 4: Simplify right side
    15,396.69x = 206,636,730.24
  5. Step 5: Solve for x
    x = 206,636,730.24/15,396.69
  6. Step 6: Final answer
    x = 13,420.85

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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.