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Finding the Fourth Proportional to 20,799.70, 31,211.70 and 7,653.40

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Solution

The fourth proportional to 20,799.70, 31,211.70 and 7,653.40 is: 11,484.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,799.70 : 31,211.70 = 7,653.40 : x
  2. Step 2: Convert to fraction form
    20,799.70/31,211.70 = 7,653.40/x
  3. Step 3: Cross multiply
    20,799.70x = 31,211.70 × 7,653.40
  4. Step 4: Simplify right side
    20,799.70x = 238,875,624.78
  5. Step 5: Solve for x
    x = 238,875,624.78/20,799.70
  6. Step 6: Final answer
    x = 11,484.57

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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.