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Finding the Fourth Proportional to 8,619.90, 12,897.45 and 7,842.30

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Solution

The fourth proportional to 8,619.90, 12,897.45 and 7,842.30 is: 11,733.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,619.90 : 12,897.45 = 7,842.30 : x
  2. Step 2: Convert to fraction form
    8,619.90/12,897.45 = 7,842.30/x
  3. Step 3: Cross multiply
    8,619.90x = 12,897.45 × 7,842.30
  4. Step 4: Simplify right side
    8,619.90x = 101,145,672.14
  5. Step 5: Solve for x
    x = 101,145,672.14/8,619.90
  6. Step 6: Final answer
    x = 11,733.97

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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.