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Finding the Fourth Proportional to 21,390.96, 32,090.64 and 7,351.92

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Solution

The fourth proportional to 21,390.96, 32,090.64 and 7,351.92 is: 11,029.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.96 : 32,090.64 = 7,351.92 : x
  2. Step 2: Convert to fraction form
    21,390.96/32,090.64 = 7,351.92/x
  3. Step 3: Cross multiply
    21,390.96x = 32,090.64 × 7,351.92
  4. Step 4: Simplify right side
    21,390.96x = 235,927,818.03
  5. Step 5: Solve for x
    x = 235,927,818.03/21,390.96
  6. Step 6: Final answer
    x = 11,029.32

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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.