Home / 15,318.36-21,123.32-12,126.56

Finding the Fourth Proportional to 15,318.36, 21,123.32 and 12,126.56

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Solution

The fourth proportional to 15,318.36, 21,123.32 and 12,126.56 is: 16,721.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,318.36 : 21,123.32 = 12,126.56 : x
  2. Step 2: Convert to fraction form
    15,318.36/21,123.32 = 12,126.56/x
  3. Step 3: Cross multiply
    15,318.36x = 21,123.32 × 12,126.56
  4. Step 4: Simplify right side
    15,318.36x = 256,153,041.13
  5. Step 5: Solve for x
    x = 256,153,041.13/15,318.36
  6. Step 6: Final answer
    x = 16,721.96

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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.