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Finding the Fourth Proportional to 43,261.70, 64,904.70 and 21,075.80

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Solution

The fourth proportional to 43,261.70, 64,904.70 and 21,075.80 is: 31,619.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,261.70 : 64,904.70 = 21,075.80 : x
  2. Step 2: Convert to fraction form
    43,261.70/64,904.70 = 21,075.80/x
  3. Step 3: Cross multiply
    43,261.70x = 64,904.70 × 21,075.80
  4. Step 4: Simplify right side
    43,261.70x = 1,367,918,476.26
  5. Step 5: Solve for x
    x = 1,367,918,476.26/43,261.70
  6. Step 6: Final answer
    x = 31,619.62

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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.