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Finding the Fourth Proportional to 260,339.05, 390,570.87 and 91,897.18

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Solution

The fourth proportional to 260,339.05, 390,570.87 and 91,897.18 is: 137,867.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,339.05 : 390,570.87 = 91,897.18 : x
  2. Step 2: Convert to fraction form
    260,339.05/390,570.87 = 91,897.18/x
  3. Step 3: Cross multiply
    260,339.05x = 390,570.87 × 91,897.18
  4. Step 4: Simplify right side
    260,339.05x = 35,892,361,543.15
  5. Step 5: Solve for x
    x = 35,892,361,543.15/260,339.05
  6. Step 6: Final answer
    x = 137,867.76

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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.