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Finding the Fourth Proportional to 30,615.78, 45,918.15 and 8,426.28

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Solution

The fourth proportional to 30,615.78, 45,918.15 and 8,426.28 is: 12,637.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,615.78 : 45,918.15 = 8,426.28 : x
  2. Step 2: Convert to fraction form
    30,615.78/45,918.15 = 8,426.28/x
  3. Step 3: Cross multiply
    30,615.78x = 45,918.15 × 8,426.28
  4. Step 4: Simplify right side
    30,615.78x = 386,919,188.98
  5. Step 5: Solve for x
    x = 386,919,188.98/30,615.78
  6. Step 6: Final answer
    x = 12,637.90

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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.