Home / 15,315.23-21,129.75-9,568.78

Finding the Fourth Proportional to 15,315.23, 21,129.75 and 9,568.78

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Solution

The fourth proportional to 15,315.23, 21,129.75 and 9,568.78 is: 13,201.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,315.23 : 21,129.75 = 9,568.78 : x
  2. Step 2: Convert to fraction form
    15,315.23/21,129.75 = 9,568.78/x
  3. Step 3: Cross multiply
    15,315.23x = 21,129.75 × 9,568.78
  4. Step 4: Simplify right side
    15,315.23x = 202,185,981.78
  5. Step 5: Solve for x
    x = 202,185,981.78/15,315.23
  6. Step 6: Final answer
    x = 13,201.63

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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.