Home / 20,386.60-28,129.56-12,318.60

Finding the Fourth Proportional to 20,386.60, 28,129.56 and 12,318.60

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Solution

The fourth proportional to 20,386.60, 28,129.56 and 12,318.60 is: 16,997.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.60 : 28,129.56 = 12,318.60 : x
  2. Step 2: Convert to fraction form
    20,386.60/28,129.56 = 12,318.60/x
  3. Step 3: Cross multiply
    20,386.60x = 28,129.56 × 12,318.60
  4. Step 4: Simplify right side
    20,386.60x = 346,516,797.82
  5. Step 5: Solve for x
    x = 346,516,797.82/20,386.60
  6. Step 6: Final answer
    x = 16,997.28

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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.