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Finding the Fourth Proportional to 260,389.20, 390,486.60 and 91,844.40

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Solution

The fourth proportional to 260,389.20, 390,486.60 and 91,844.40 is: 137,732.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,389.20 : 390,486.60 = 91,844.40 : x
  2. Step 2: Convert to fraction form
    260,389.20/390,486.60 = 91,844.40/x
  3. Step 3: Cross multiply
    260,389.20x = 390,486.60 × 91,844.40
  4. Step 4: Simplify right side
    260,389.20x = 35,864,007,485.04
  5. Step 5: Solve for x
    x = 35,864,007,485.04/260,389.20
  6. Step 6: Final answer
    x = 137,732.32

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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.