Home / 20,579.49-28,409.51-13,785.21

Finding the Fourth Proportional to 20,579.49, 28,409.51 and 13,785.21

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Solution

The fourth proportional to 20,579.49, 28,409.51 and 13,785.21 is: 19,030.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,579.49 : 28,409.51 = 13,785.21 : x
  2. Step 2: Convert to fraction form
    20,579.49/28,409.51 = 13,785.21/x
  3. Step 3: Cross multiply
    20,579.49x = 28,409.51 × 13,785.21
  4. Step 4: Simplify right side
    20,579.49x = 391,631,095.81
  5. Step 5: Solve for x
    x = 391,631,095.81/20,579.49
  6. Step 6: Final answer
    x = 19,030.17

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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.