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Finding the Fourth Proportional to 61,161.60, 91,742.40 and 42,499.20

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Solution

The fourth proportional to 61,161.60, 91,742.40 and 42,499.20 is: 63,748.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,161.60 : 91,742.40 = 42,499.20 : x
  2. Step 2: Convert to fraction form
    61,161.60/91,742.40 = 42,499.20/x
  3. Step 3: Cross multiply
    61,161.60x = 91,742.40 × 42,499.20
  4. Step 4: Simplify right side
    61,161.60x = 3,898,978,606.08
  5. Step 5: Solve for x
    x = 3,898,978,606.08/61,161.60
  6. Step 6: Final answer
    x = 63,748.80

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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.