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Finding the Fourth Proportional to 61,847.68, 85,420.80 and 40,721.44

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Solution

The fourth proportional to 61,847.68, 85,420.80 and 40,721.44 is: 56,242.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,847.68 : 85,420.80 = 40,721.44 : x
  2. Step 2: Convert to fraction form
    61,847.68/85,420.80 = 40,721.44/x
  3. Step 3: Cross multiply
    61,847.68x = 85,420.80 × 40,721.44
  4. Step 4: Simplify right side
    61,847.68x = 3,478,457,981.95
  5. Step 5: Solve for x
    x = 3,478,457,981.95/61,847.68
  6. Step 6: Final answer
    x = 56,242.34

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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.