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Finding the Fourth Proportional to 7,779.38, 10,780.95 and 7,631.70

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Solution

The fourth proportional to 7,779.38, 10,780.95 and 7,631.70 is: 10,576.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,779.38 : 10,780.95 = 7,631.70 : x
  2. Step 2: Convert to fraction form
    7,779.38/10,780.95 = 7,631.70/x
  3. Step 3: Cross multiply
    7,779.38x = 10,780.95 × 7,631.70
  4. Step 4: Simplify right side
    7,779.38x = 82,276,976.12
  5. Step 5: Solve for x
    x = 82,276,976.12/7,779.38
  6. Step 6: Final answer
    x = 10,576.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.