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Finding the Fourth Proportional to 260,403.72, 390,636.80 and 91,889.25

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Solution

The fourth proportional to 260,403.72, 390,636.80 and 91,889.25 is: 137,844.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,403.72 : 390,636.80 = 91,889.25 : x
  2. Step 2: Convert to fraction form
    260,403.72/390,636.80 = 91,889.25/x
  3. Step 3: Cross multiply
    260,403.72x = 390,636.80 × 91,889.25
  4. Step 4: Simplify right side
    260,403.72x = 35,895,322,114.95
  5. Step 5: Solve for x
    x = 35,895,322,114.95/260,403.72
  6. Step 6: Final answer
    x = 137,844.89

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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.