Home / 20,989.53-28,965.51-11,558.07

Finding the Fourth Proportional to 20,989.53, 28,965.51 and 11,558.07

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Solution

The fourth proportional to 20,989.53, 28,965.51 and 11,558.07 is: 15,950.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,989.53 : 28,965.51 = 11,558.07 : x
  2. Step 2: Convert to fraction form
    20,989.53/28,965.51 = 11,558.07/x
  3. Step 3: Cross multiply
    20,989.53x = 28,965.51 × 11,558.07
  4. Step 4: Simplify right side
    20,989.53x = 334,785,392.17
  5. Step 5: Solve for x
    x = 334,785,392.17/20,989.53
  6. Step 6: Final answer
    x = 15,950.11

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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.