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Finding the Fourth Proportional to 66,657, 91,987.78 and 39,801.86

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Solution

The fourth proportional to 66,657, 91,987.78 and 39,801.86 is: 54,927.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,657 : 91,987.78 = 39,801.86 : x
  2. Step 2: Convert to fraction form
    66,657/91,987.78 = 39,801.86/x
  3. Step 3: Cross multiply
    66,657x = 91,987.78 × 39,801.86
  4. Step 4: Simplify right side
    66,657x = 3,661,284,741.27
  5. Step 5: Solve for x
    x = 3,661,284,741.27/66,657
  6. Step 6: Final answer
    x = 54,927.24

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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.