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Finding the Fourth Proportional to 133,080.90, 183,643.88 and 72,639.50

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Solution

The fourth proportional to 133,080.90, 183,643.88 and 72,639.50 is: 100,238.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,080.90 : 183,643.88 = 72,639.50 : x
  2. Step 2: Convert to fraction form
    133,080.90/183,643.88 = 72,639.50/x
  3. Step 3: Cross multiply
    133,080.90x = 183,643.88 × 72,639.50
  4. Step 4: Simplify right side
    133,080.90x = 13,339,799,621.26
  5. Step 5: Solve for x
    x = 13,339,799,621.26/133,080.90
  6. Step 6: Final answer
    x = 100,238.27

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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.