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Finding the Fourth Proportional to 72,681.66, 100,295.70 and 40,855.36

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Solution

The fourth proportional to 72,681.66, 100,295.70 and 40,855.36 is: 56,377.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,681.66 : 100,295.70 = 40,855.36 : x
  2. Step 2: Convert to fraction form
    72,681.66/100,295.70 = 40,855.36/x
  3. Step 3: Cross multiply
    72,681.66x = 100,295.70 × 40,855.36
  4. Step 4: Simplify right side
    72,681.66x = 4,097,616,929.95
  5. Step 5: Solve for x
    x = 4,097,616,929.95/72,681.66
  6. Step 6: Final answer
    x = 56,377.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.