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Finding the Fourth Proportional to 66,420.77, 91,661.09 and 39,564.41

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Solution

The fourth proportional to 66,420.77, 91,661.09 and 39,564.41 is: 54,599.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,420.77 : 91,661.09 = 39,564.41 : x
  2. Step 2: Convert to fraction form
    66,420.77/91,661.09 = 39,564.41/x
  3. Step 3: Cross multiply
    66,420.77x = 91,661.09 × 39,564.41
  4. Step 4: Simplify right side
    66,420.77x = 3,626,516,289.68
  5. Step 5: Solve for x
    x = 3,626,516,289.68/66,420.77
  6. Step 6: Final answer
    x = 54,599.13

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1.5x scale

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.