Home / 15,721.37-21,689.08-8,913.95

Finding the Fourth Proportional to 15,721.37, 21,689.08 and 8,913.95

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Solution

The fourth proportional to 15,721.37, 21,689.08 and 8,913.95 is: 12,297.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.37 : 21,689.08 = 8,913.95 : x
  2. Step 2: Convert to fraction form
    15,721.37/21,689.08 = 8,913.95/x
  3. Step 3: Cross multiply
    15,721.37x = 21,689.08 × 8,913.95
  4. Step 4: Simplify right side
    15,721.37x = 193,335,330.10
  5. Step 5: Solve for x
    x = 193,335,330.10/15,721.37
  6. Step 6: Final answer
    x = 12,297.62

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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.