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Finding the Fourth Proportional to 21,157.45, 31,750.79 and 7,306.45

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Solution

The fourth proportional to 21,157.45, 31,750.79 and 7,306.45 is: 10,964.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,157.45 : 31,750.79 = 7,306.45 : x
  2. Step 2: Convert to fraction form
    21,157.45/31,750.79 = 7,306.45/x
  3. Step 3: Cross multiply
    21,157.45x = 31,750.79 × 7,306.45
  4. Step 4: Simplify right side
    21,157.45x = 231,985,622.28
  5. Step 5: Solve for x
    x = 231,985,622.28/21,157.45
  6. Step 6: Final answer
    x = 10,964.72

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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.