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Finding the Fourth Proportional to 9,873.80, 14,789.10 and 8,779.40

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Solution

The fourth proportional to 9,873.80, 14,789.10 and 8,779.40 is: 13,149.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,873.80 : 14,789.10 = 8,779.40 : x
  2. Step 2: Convert to fraction form
    9,873.80/14,789.10 = 8,779.40/x
  3. Step 3: Cross multiply
    9,873.80x = 14,789.10 × 8,779.40
  4. Step 4: Simplify right side
    9,873.80x = 129,839,424.54
  5. Step 5: Solve for x
    x = 129,839,424.54/9,873.80
  6. Step 6: Final answer
    x = 13,149.89

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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.