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Finding the Fourth Proportional to 66,478.39, 91,752.08 and 39,622.64

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Solution

The fourth proportional to 66,478.39, 91,752.08 and 39,622.64 is: 54,686.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,478.39 : 91,752.08 = 39,622.64 : x
  2. Step 2: Convert to fraction form
    66,478.39/91,752.08 = 39,622.64/x
  3. Step 3: Cross multiply
    66,478.39x = 91,752.08 × 39,622.64
  4. Step 4: Simplify right side
    66,478.39x = 3,635,458,978.22
  5. Step 5: Solve for x
    x = 3,635,458,978.22/66,478.39
  6. Step 6: Final answer
    x = 54,686.33

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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.