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Finding the Fourth Proportional to 7,861.80, 11,789.64 and 2,930.32

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Solution

The fourth proportional to 7,861.80, 11,789.64 and 2,930.32 is: 4,394.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,861.80 : 11,789.64 = 2,930.32 : x
  2. Step 2: Convert to fraction form
    7,861.80/11,789.64 = 2,930.32/x
  3. Step 3: Cross multiply
    7,861.80x = 11,789.64 × 2,930.32
  4. Step 4: Simplify right side
    7,861.80x = 34,547,417.88
  5. Step 5: Solve for x
    x = 34,547,417.88/7,861.80
  6. Step 6: Final answer
    x = 4,394.34

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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.