Home / 20,985.66-28,960.86-11,426.18

Finding the Fourth Proportional to 20,985.66, 28,960.86 and 11,426.18

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Solution

The fourth proportional to 20,985.66, 28,960.86 and 11,426.18 is: 15,768.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.66 : 28,960.86 = 11,426.18 : x
  2. Step 2: Convert to fraction form
    20,985.66/28,960.86 = 11,426.18/x
  3. Step 3: Cross multiply
    20,985.66x = 28,960.86 × 11,426.18
  4. Step 4: Simplify right side
    20,985.66x = 330,911,999.31
  5. Step 5: Solve for x
    x = 330,911,999.31/20,985.66
  6. Step 6: Final answer
    x = 15,768.48

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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.