Home / 20,317.85-30,478.80-7,664.40

Finding the Fourth Proportional to 20,317.85, 30,478.80 and 7,664.40

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Solution

The fourth proportional to 20,317.85, 30,478.80 and 7,664.40 is: 11,497.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,317.85 : 30,478.80 = 7,664.40 : x
  2. Step 2: Convert to fraction form
    20,317.85/30,478.80 = 7,664.40/x
  3. Step 3: Cross multiply
    20,317.85x = 30,478.80 × 7,664.40
  4. Step 4: Simplify right side
    20,317.85x = 233,601,714.72
  5. Step 5: Solve for x
    x = 233,601,714.72/20,317.85
  6. Step 6: Final answer
    x = 11,497.36

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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.