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Finding the Fourth Proportional to 260,308.81, 390,423.81 and 89,556.51

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Solution

The fourth proportional to 260,308.81, 390,423.81 and 89,556.51 is: 134,321.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,308.81 : 390,423.81 = 89,556.51 : x
  2. Step 2: Convert to fraction form
    260,308.81/390,423.81 = 89,556.51/x
  3. Step 3: Cross multiply
    260,308.81x = 390,423.81 × 89,556.51
  4. Step 4: Simplify right side
    260,308.81x = 34,964,994,168.55
  5. Step 5: Solve for x
    x = 34,964,994,168.55/260,308.81
  6. Step 6: Final answer
    x = 134,321.21

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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.