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Finding the Fourth Proportional to 61,159.70, 91,739.55 and 21,720.80

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Solution

The fourth proportional to 61,159.70, 91,739.55 and 21,720.80 is: 32,581.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,159.70 : 91,739.55 = 21,720.80 : x
  2. Step 2: Convert to fraction form
    61,159.70/91,739.55 = 21,720.80/x
  3. Step 3: Cross multiply
    61,159.70x = 91,739.55 × 21,720.80
  4. Step 4: Simplify right side
    61,159.70x = 1,992,656,417.64
  5. Step 5: Solve for x
    x = 1,992,656,417.64/61,159.70
  6. Step 6: Final answer
    x = 32,581.20

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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.