Home / 20,979.54-28,950.75-11,547.90

Finding the Fourth Proportional to 20,979.54, 28,950.75 and 11,547.90

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Solution

The fourth proportional to 20,979.54, 28,950.75 and 11,547.90 is: 15,935.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.54 : 28,950.75 = 11,547.90 : x
  2. Step 2: Convert to fraction form
    20,979.54/28,950.75 = 11,547.90/x
  3. Step 3: Cross multiply
    20,979.54x = 28,950.75 × 11,547.90
  4. Step 4: Simplify right side
    20,979.54x = 334,320,365.93
  5. Step 5: Solve for x
    x = 334,320,365.93/20,979.54
  6. Step 6: Final answer
    x = 15,935.54

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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.