Home / 28,553.40-42,878.70-21,166.20

Finding the Fourth Proportional to 28,553.40, 42,878.70 and 21,166.20

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Solution

The fourth proportional to 28,553.40, 42,878.70 and 21,166.20 is: 31,785.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,553.40 : 42,878.70 = 21,166.20 : x
  2. Step 2: Convert to fraction form
    28,553.40/42,878.70 = 21,166.20/x
  3. Step 3: Cross multiply
    28,553.40x = 42,878.70 × 21,166.20
  4. Step 4: Simplify right side
    28,553.40x = 907,579,139.94
  5. Step 5: Solve for x
    x = 907,579,139.94/28,553.40
  6. Step 6: Final answer
    x = 31,785.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.