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Finding the Fourth Proportional to 66,409.90, 99,629.43 and 19,666.42

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Solution

The fourth proportional to 66,409.90, 99,629.43 and 19,666.42 is: 29,503.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,409.90 : 99,629.43 = 19,666.42 : x
  2. Step 2: Convert to fraction form
    66,409.90/99,629.43 = 19,666.42/x
  3. Step 3: Cross multiply
    66,409.90x = 99,629.43 × 19,666.42
  4. Step 4: Simplify right side
    66,409.90x = 1,959,354,214.74
  5. Step 5: Solve for x
    x = 1,959,354,214.74/66,409.90
  6. Step 6: Final answer
    x = 29,503.95

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1.5x scale

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.