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Finding the Fourth Proportional to 78,585.58, 117,877.21 and 19,421.25

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Solution

The fourth proportional to 78,585.58, 117,877.21 and 19,421.25 is: 29,131.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,585.58 : 117,877.21 = 19,421.25 : x
  2. Step 2: Convert to fraction form
    78,585.58/117,877.21 = 19,421.25/x
  3. Step 3: Cross multiply
    78,585.58x = 117,877.21 × 19,421.25
  4. Step 4: Simplify right side
    78,585.58x = 2,289,322,383.36
  5. Step 5: Solve for x
    x = 2,289,322,383.36/78,585.58
  6. Step 6: Final answer
    x = 29,131.58

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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.