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Finding the Fourth Proportional to 20,871.54, 31,303.98 and 7,720.92

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Solution

The fourth proportional to 20,871.54, 31,303.98 and 7,720.92 is: 11,580.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.54 : 31,303.98 = 7,720.92 : x
  2. Step 2: Convert to fraction form
    20,871.54/31,303.98 = 7,720.92/x
  3. Step 3: Cross multiply
    20,871.54x = 31,303.98 × 7,720.92
  4. Step 4: Simplify right side
    20,871.54x = 241,695,525.26
  5. Step 5: Solve for x
    x = 241,695,525.26/20,871.54
  6. Step 6: Final answer
    x = 11,580.15

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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.