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Finding the Fourth Proportional to 40,807, 61,221.30 and 13,105.72

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Solution

The fourth proportional to 40,807, 61,221.30 and 13,105.72 is: 19,662.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,807 : 61,221.30 = 13,105.72 : x
  2. Step 2: Convert to fraction form
    40,807/61,221.30 = 13,105.72/x
  3. Step 3: Cross multiply
    40,807x = 61,221.30 × 13,105.72
  4. Step 4: Simplify right side
    40,807x = 802,349,215.84
  5. Step 5: Solve for x
    x = 802,349,215.84/40,807
  6. Step 6: Final answer
    x = 19,662.05

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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.