Home / 12,840.81-17,720.28-7,098.86

Finding the Fourth Proportional to 12,840.81, 17,720.28 and 7,098.86

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Solution

The fourth proportional to 12,840.81, 17,720.28 and 7,098.86 is: 9,796.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,840.81 : 17,720.28 = 7,098.86 : x
  2. Step 2: Convert to fraction form
    12,840.81/17,720.28 = 7,098.86/x
  3. Step 3: Cross multiply
    12,840.81x = 17,720.28 × 7,098.86
  4. Step 4: Simplify right side
    12,840.81x = 125,793,698.28
  5. Step 5: Solve for x
    x = 125,793,698.28/12,840.81
  6. Step 6: Final answer
    x = 9,796.40

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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.