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Finding the Fourth Proportional to 21,245.76, 31,868.80 and 7,394.72

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Solution

The fourth proportional to 21,245.76, 31,868.80 and 7,394.72 is: 11,092.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,245.76 : 31,868.80 = 7,394.72 : x
  2. Step 2: Convert to fraction form
    21,245.76/31,868.80 = 7,394.72/x
  3. Step 3: Cross multiply
    21,245.76x = 31,868.80 × 7,394.72
  4. Step 4: Simplify right side
    21,245.76x = 235,660,852.74
  5. Step 5: Solve for x
    x = 235,660,852.74/21,245.76
  6. Step 6: Final answer
    x = 11,092.14

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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.