Home / 39,780.40-54,896.14-21,875.10

Finding the Fourth Proportional to 39,780.40, 54,896.14 and 21,875.10

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Solution

The fourth proportional to 39,780.40, 54,896.14 and 21,875.10 is: 30,187.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,780.40 : 54,896.14 = 21,875.10 : x
  2. Step 2: Convert to fraction form
    39,780.40/54,896.14 = 21,875.10/x
  3. Step 3: Cross multiply
    39,780.40x = 54,896.14 × 21,875.10
  4. Step 4: Simplify right side
    39,780.40x = 1,200,858,552.11
  5. Step 5: Solve for x
    x = 1,200,858,552.11/39,780.40
  6. Step 6: Final answer
    x = 30,187.19

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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.