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Finding the Fourth Proportional to 21,166.94, 31,765.02 and 7,315.94

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Solution

The fourth proportional to 21,166.94, 31,765.02 and 7,315.94 is: 10,978.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,166.94 : 31,765.02 = 7,315.94 : x
  2. Step 2: Convert to fraction form
    21,166.94/31,765.02 = 7,315.94/x
  3. Step 3: Cross multiply
    21,166.94x = 31,765.02 × 7,315.94
  4. Step 4: Simplify right side
    21,166.94x = 232,390,980.42
  5. Step 5: Solve for x
    x = 232,390,980.42/21,166.94
  6. Step 6: Final answer
    x = 10,978.96

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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.