Home / 20,776.78-28,671.84-11,345.32

Finding the Fourth Proportional to 20,776.78, 28,671.84 and 11,345.32

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Solution

The fourth proportional to 20,776.78, 28,671.84 and 11,345.32 is: 15,656.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,776.78 : 28,671.84 = 11,345.32 : x
  2. Step 2: Convert to fraction form
    20,776.78/28,671.84 = 11,345.32/x
  3. Step 3: Cross multiply
    20,776.78x = 28,671.84 × 11,345.32
  4. Step 4: Simplify right side
    20,776.78x = 325,291,199.79
  5. Step 5: Solve for x
    x = 325,291,199.79/20,776.78
  6. Step 6: Final answer
    x = 15,656.48

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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.