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Finding the Fourth Proportional to 20,521.71, 30,782.57 and 4,939.34

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Solution

The fourth proportional to 20,521.71, 30,782.57 and 4,939.34 is: 7,409.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,521.71 : 30,782.57 = 4,939.34 : x
  2. Step 2: Convert to fraction form
    20,521.71/30,782.57 = 4,939.34/x
  3. Step 3: Cross multiply
    20,521.71x = 30,782.57 × 4,939.34
  4. Step 4: Simplify right side
    20,521.71x = 152,045,553.17
  5. Step 5: Solve for x
    x = 152,045,553.17/20,521.71
  6. Step 6: Final answer
    x = 7,409.01

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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.