Home / 12,915.39-19,378.53-7,721.25

Finding the Fourth Proportional to 12,915.39, 19,378.53 and 7,721.25

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Solution

The fourth proportional to 12,915.39, 19,378.53 and 7,721.25 is: 11,585.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,915.39 : 19,378.53 = 7,721.25 : x
  2. Step 2: Convert to fraction form
    12,915.39/19,378.53 = 7,721.25/x
  3. Step 3: Cross multiply
    12,915.39x = 19,378.53 × 7,721.25
  4. Step 4: Simplify right side
    12,915.39x = 149,626,474.76
  5. Step 5: Solve for x
    x = 149,626,474.76/12,915.39
  6. Step 6: Final answer
    x = 11,585.13

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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.