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Finding the Fourth Proportional to 61,113.60, 91,686.60 and 21,666.60

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Solution

The fourth proportional to 61,113.60, 91,686.60 and 21,666.60 is: 32,505.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,113.60 : 91,686.60 = 21,666.60 : x
  2. Step 2: Convert to fraction form
    61,113.60/91,686.60 = 21,666.60/x
  3. Step 3: Cross multiply
    61,113.60x = 91,686.60 × 21,666.60
  4. Step 4: Simplify right side
    61,113.60x = 1,986,536,887.56
  5. Step 5: Solve for x
    x = 1,986,536,887.56/61,113.60
  6. Step 6: Final answer
    x = 32,505.64

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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.