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Finding the Fourth Proportional to 40,678.59, 61,020.05 and 12,618.03

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Solution

The fourth proportional to 40,678.59, 61,020.05 and 12,618.03 is: 18,927.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,678.59 : 61,020.05 = 12,618.03 : x
  2. Step 2: Convert to fraction form
    40,678.59/61,020.05 = 12,618.03/x
  3. Step 3: Cross multiply
    40,678.59x = 61,020.05 × 12,618.03
  4. Step 4: Simplify right side
    40,678.59x = 769,952,758.41
  5. Step 5: Solve for x
    x = 769,952,758.41/40,678.59
  6. Step 6: Final answer
    x = 18,927.72

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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.