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Finding the Fourth Proportional to 20,257.70, 30,386.55 and 7,108.70

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Solution

The fourth proportional to 20,257.70, 30,386.55 and 7,108.70 is: 10,663.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,257.70 : 30,386.55 = 7,108.70 : x
  2. Step 2: Convert to fraction form
    20,257.70/30,386.55 = 7,108.70/x
  3. Step 3: Cross multiply
    20,257.70x = 30,386.55 × 7,108.70
  4. Step 4: Simplify right side
    20,257.70x = 216,008,867.99
  5. Step 5: Solve for x
    x = 216,008,867.99/20,257.70
  6. Step 6: Final answer
    x = 10,663.05

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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.