Home / 20,478.18-30,678.39-11,686.44

Finding the Fourth Proportional to 20,478.18, 30,678.39 and 11,686.44

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Solution

The fourth proportional to 20,478.18, 30,678.39 and 11,686.44 is: 17,507.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.18 : 30,678.39 = 11,686.44 : x
  2. Step 2: Convert to fraction form
    20,478.18/30,678.39 = 11,686.44/x
  3. Step 3: Cross multiply
    20,478.18x = 30,678.39 × 11,686.44
  4. Step 4: Simplify right side
    20,478.18x = 358,521,164.03
  5. Step 5: Solve for x
    x = 358,521,164.03/20,478.18
  6. Step 6: Final answer
    x = 17,507.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.