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Finding the Fourth Proportional to 78,491.31, 117,741.04 and 25,904.90

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Solution

The fourth proportional to 78,491.31, 117,741.04 and 25,904.90 is: 38,858.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,491.31 : 117,741.04 = 25,904.90 : x
  2. Step 2: Convert to fraction form
    78,491.31/117,741.04 = 25,904.90/x
  3. Step 3: Cross multiply
    78,491.31x = 117,741.04 × 25,904.90
  4. Step 4: Simplify right side
    78,491.31x = 3,050,069,213.63
  5. Step 5: Solve for x
    x = 3,050,069,213.63/78,491.31
  6. Step 6: Final answer
    x = 38,858.69

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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.