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Finding the Fourth Proportional to 20,897.40, 31,346.10 and 7,748.40

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Solution

The fourth proportional to 20,897.40, 31,346.10 and 7,748.40 is: 11,622.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,897.40 : 31,346.10 = 7,748.40 : x
  2. Step 2: Convert to fraction form
    20,897.40/31,346.10 = 7,748.40/x
  3. Step 3: Cross multiply
    20,897.40x = 31,346.10 × 7,748.40
  4. Step 4: Simplify right side
    20,897.40x = 242,882,121.24
  5. Step 5: Solve for x
    x = 242,882,121.24/20,897.40
  6. Step 6: Final answer
    x = 11,622.60

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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.